减压阀安装维护说明
Rev. 0040701000 0410 englisch
1.0 General information on operating
instructions.....................................................22.0 Notes on possible dangers (2)
2.1Significance of symbols (2)
2.2Explanatory notes on safety information.................23.0 Storage and transport ..................................34.0 Description.....................................................34.1Scope of applications..............................................34.2Operating principles................................................34.3Diagram ..................................................................44.4Parts .......................................................................44.5Technical data - remarks.........................................54.6Marking (6)
5.0 Installation (7)
5.1General notes on installation...................................75.2Requirements at the place of installation................85.3Installation instructions concerning actuators (8)
5.4Control line, flow restrictor, water seal pot..............95.5System arrangement - pressure reducing station 105.6Strainer .................................................................115.7Safety valves (11)
6.0 Putting the valve into operation (11)
7.0 Care and maintenance................................128.0 Troubleshooting..........................................129.0 Troubleshooting table ...............................1310.0 Dismantling the valve or the top part .....1511.0 Warranty / Guarantee................................1512.0 EC declaration of conformity. (16)
Operating and installation instructions
Pressure reducing valve PREDU ?
Contents
PREDU
(Series 700)
Page 2Rev. 0040701000 0410
1.0 General information on operating instructions
These operating instructions provide information on mounting and maintaining the fittings. Please contact the supplier or the manufacturer in case of problems which cannot be solved by reference to the operating instructions.
They are binding on the transport, storage, installation, start-up, operation, maintenance and repair.
The notes and warnings must be observed and adhered to.
- Handling and all work must be carried out by expert personnel or all activities must be supervised and checked.
It is the owner’s responsibility to define areas of responsibility and competence and to monitor the personnel.
- In addition, current regional safety requirements must be applied and observed when taking the fittings out of service as well as when maintaining and repairing them.The manufacturer reserves the right to introduce technical modifications at any time.These Operating Instructions comply with the requirements of EU Directives.
2.0 Notes on possible dangers
2.1 Significance of symbols
2.2 Explanatory notes on safety information
In these Operating and Installation Instructions dangers, risks and items of safety information are highlighted to attract special attention.
Information marked with the above symbol and “ATTENTION !” describe practices, a failure to comply with which can result in serious injury or danger of death for users or third parties or in material damage to the system or the environment. It is vital to comply with these practices and to monitor compliance.
All other information not specifically emphasised such as transport, installation, operating and maintenance instructions as well as technical data (in the operating instructions, product documentation and on the device itself) must also be complied with to the fullest extent in order to avoid faults which in turn can cause serious injury to persons or damage to property.
Warning of general danger.
Non-compliance with operating instructions is dangerous!Read the operating instructions before installation, operation, maintenance or disassembly and adhere to them strictly.
Rev. 0040701000 0410
Page 3
3.0 Storage and transport
- At -20°C to +65°C.
- The paint is a base coat to protect against corrosion during transportation and storage. Do not damage paint protection.
4.0 Description
4.1 Scope of applications
Pressure reducing valves are used for …pressure regulation of liquids, steam, gases and vapours in the procedure and process technic as well as in the plant manufacture“.
The information complies to the Pressure Equipment Directive 97/23/EC.It is the responsibility of the machine planner to ensure compliance.The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
The pressure reducing valve is a direct acting proportional regulator for regulating the pressure of fluid, gas and vapour media of Fluid Group II pursuant to Pressure Equipment Directive 97/23/EC. No auxiliary energy is needed.
In a pressureless state the valve is fully open. The media passes through the valve from the inlet to the outlet. The downstream pressure sensing point should be positioned at least 10x DN or a minimum of 1 m away from the valve, and is passed on to the actuator over the control line pipe (refer to Fig. 4).
For operating temperatures above the allowable actuator temperature (refer to points 4.4 and 5.4) a water seal pot must be installed. The whole system, water seal pot, control line and actuator must be filled with liquid (by steam with water). The downstream pressure is converted over the actuator diaphragm in a force working in the disc closing direction.
The spring force is attained in the spindle over a pin and coupling and is opposed through the diaphragm force, therefore works in the disc open direction. When both forces are equal, the valve is balanced, and the downstream pressure is maintained constant. When the downstream pressure is altered the disc either …opens“ or …closes“.
Page 4
Rev. 0040701000 0410
4.3 Diagram
4.4 Parts
Refer to the data sheet for information about materials with designations and figure numbers.
Fig. 1
Pos.Designation Pos.Designation 1Body
19Screw
2Screwed seat 20Thread pin 3Stud 21Guide bush 4Gasket
22Guide coupling 5Bush housing 23Cylindrical balls 6Gasket 24Securing wire 7Guide bush
25Spring
8Balanced bellow unit 26Spring plate 9Disc unit
27Axial bearing 11Hexagon screw 28Pressure plate 12Bonnet closed 29Pin
14Hexagon nut 30Lock nut
15Gasket
31DMA-Pneumatic actuator 16Sealing bellow unit 31.14Bleeder plug 17Adjusting plate 31.15Sealing ring 18
Head
31.16
Plug
4.5 Technical data - remarks
for
- Principal dimensions
- Pressure-temperature-ratings, etc. refer to datasheet.
Nominal diameter:DN 15 - DN 100, 1“ - 4“
Pressure class:PN 16, PN 25, PN 40, ANSI 150, ANSI 300
Body material:EN-JL1040, EN-JS1049, 1.0619+N, SA216WCB
Actuator size:DMA 40, 80, 160, 250, 400 - NBR, EPDM
Downstream pressure:acc. to downstream pressure table min. 0,2 bar, max. 16 bar Temperature - valve:acc. to pressure-temperature table refer to datasheet Temperature - actuator:max. 100°C (NBR-diaphragm)
max. 130°C (EPDM-diaphragm)
Disc seal:Metal
Spindle tightness:Stainless steel bellow
Rev. 0040701000 0410Page 5
4.6 Marking
Figure number /
(1. and 2. position)
Fig. 2: Body
(1. and 2. position)
Fig. 3: Actuator
Address of manufacturer: refer to item 11.0 Warranty / Guarantee
According to the Pressure Equipment Directive table 6, annex II, valves without safety function are only allowed to bear the CE-marking DN32 onwards
Other marking is made on the outlet flange.
e.g. BA/BQ or approvals such as LR, GL, etc.
Page 6Rev. 0040701000 0410
5.0 Installation
5.1 General notes on installation
The following points should be taken into account besides the general principles governing installation work:
- Planners / construction companies or operators are responsible for positioning and installing products.
- The valves are designed for application, not influenced from weather.
- For application outside or in adverse environments like corrosion-promoting conditions (sea water, chemical vapours, etc.), special constructions or protective measures are recommended.
- Before installing the pressure reducing valve rinse and clean the system otherwise the seat / disc will be damaged and the control hole will be blocked.
- Centre packings between the flanges.
- Keep the bonnet thread free from paint.
Rev. 0040701000 0410Page 7
5.2 Requirements at the place of installation
The place of installation should be easily accessible and provide ample space for maintenance and removing the actuator. Install a stop valve upstream and downstream of the pressure reducing valve to enable repair and maintenance work, without emptying the system. A bypass line enables a continuous working by hand. Install manometers upstream and downstream to control the pressures.
Refer to a system sample under point 5.5 where all valves are shown. The piping before and after the pressure reducing valve must be dimensioned so that the max. flow speed is not exceeded, and the pressure reduction should be near to the users.
The nominal diameter of the pipes in front of and behind the pressure reducing valve must be chosen corresponding to max. allowable flow rates (liquids max. 5m/s; saturated steam max. 25m/s; steam and gases max. 50m/s). With compressible media (i.e. steam, air) the downstream piping must be larger because when expanding the volume increase blocks the flow capacity. The rule 10 x DN is related to the larger downstream piping. When isolating of the piping, do not isolate the spring room, the actuator, the water seal pot and the control line.
5.3 Installation instructions concerning actuators
The pressure reducing valve is supplied with mounted actuator.
To alter the pressure range the actuator and spring may have to be changed in the following sequence:
- Make the system pressureless.
- Remove control piping and empty the water seal pot.
- Loosen lock nut (pos.30).
- Unscrew actuator away from the valve.
- Relax spring by turning the spring plate (pos.17).
- Remove sideways pin (pos.29) and remove the pressure plate (pos.26), bearing (pos.27), spring plate (pos.28) and spring downwards.
- Remount in the opposite way.
- Putting the valve into operation (refer to point 6.0)
Page 8Rev. 0040701000 0410
Rev. 0040701000 0410Page 9
5.4 Control line, flow restrictor, water seal pot
The control line should at least have a diameter of 10 mm and can be fixed with the help of the supplied 90°-screw. The downstream connection for the control line should be 10 x DN, at least 1 m behind the pressure reducing valve, preferably on top or on the side of the pipe. With following distributor, the connection should be direct on the distributor.
Fig. 4
(e.g. Ermeto WE 10-LLR)
R 1/4
Funnel
Operating and installation instructions
PREDU?5.5 System arrangement - pressure reducing station
Fig. 5
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Page 10Rev. 0040701000 0410
5.6 Strainer
5.7 Safety valves
6.0 Putting the valve into operation
Rev. 0040701000 0410Page 11
The operation is then as follows:
- If present open the valve in the control line.
- Open the valve behind the pressure reducing valve
- Now open the valve in front of the pressure reducing valve (medium must flow).
- Slacken spring by turning adjusting plate (pos.17) to the left, pressure reducer closes.
- Now pre-tension spring by turning adjusting plate (pos.17) to the right (size 19 spanner) until the desired downstream pressure is obtained (for possible downstream pressure see type plate on actuator), if downstream pressure is too high, slacken spring by turning adjusting plate (pos.17) to the left.
- Now the pressure reducing valve is ready for use.
7.0 Care and maintenance
Maintenance and maintenance-intervals have to be defined by the operator according to the requirements.
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and adjustment work has been carried out and completed in accordance with these Operating Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 troubleshooting table”, the supplier or manufacturer should be consulted.
Page 12Rev. 0040701000 0410
9.0 Troubleshooting table
Fault Possible cause Corrective measures
No flow Flange covers not removed.Remove flange covers.
Little flow Dirt sieve clogged.Clean / replace sieve.
Piping system clogged.Check piping system.
Kvs value of valve unsuitable.Fit valve with higher Kvs value.
Downstream pressure rises quickly when the users are turned off Seat / Disc leakage, very dirty Change valve or, if necessary,
seat/plug
Control line or flow restrictor blocked Clean control line or flow restrictor Diaphragm defect Change diaphragm
Thread plug (pos.31.14) blocked Open hole in the vent plug screw Pressure balancing hole in the disc
blocked
Open pressure balancing hole Balanced bellow defect Renew balanced bellow
Valve in the control line closed Open valve in the control line Actuator not fitted proper Loosen lock nut. Tighten actuator.
Fix lock nut.
Flange broken.Damage during transport.Replace pressure reducing valve.
Flange bolts not evenly tightened.Replace pressure reducing valve.
Transfer of unsafe forces such as
bending or torsional forces.
Install free of tension.
Media comes out of the
vent plug hole (pos.31.14)
Diaphragm leaking.Change diaphragm.
Downstream pressure can not be adjusted in the full capacity range Valve laid out to small.New layout of valve. Valve setting is wrong.Reset valve.
Valve doesn’t regulate Control line or flow restrictor blocked.Clean control line or flow restrictor.
Diaphragm defect.Change diaphragm.
Control line is connected to the vent plug hole (pos.31.14).Fix control line pipe to the control pipe connection (pos.31.15).
Downstream pressure unstable Flow restrictor not installed.Install flow restrictor.
The ratio of upstream to downstream
pressure to high.
Reduction over two stages. Install pres-
sure reducing valve in row.
Media exit out of the bon-
net (at the spindle leakage)
Sealing bellow defect.Change sealing bellow.
Downstream pressure can’t be altered Manometer defect.Change manometer.
Bonnet thread damaged.Change bonnet.
Valve closed in the control line.Open valve in the control line.
Valve stem moves in jerks.Valve plug slightly seized owing to solid
dirt particles.Clean internals, change plug and guide bush.
Rev. 0040701000 0410Page 13
Leakage too high when valve is closed.Sealing surfaces of seat/plug eroded or
worn.
Change valve or, if necessary,
seat/plug.
Sealing edge of seating damages or
worn.
Change valve or, if necessary, seat/
plug, fit strainer if necessary.
Seat/plug leaking due to dirt.Clean internals of valve, fit strainer
if necessary.
Change valve or, if necessary,
seat/plug.
Unsafe rise in downstream pressure.Safety valve not present in downstream
pressure system.
Fit safety valve.
Safety valve too small / wrong size.Reset safety valve and replace
if necessary.
Fault Possible cause Corrective measures
Page 14Rev. 0040701000 0410
10.0 Dismantling the valve or the top part
11.0 Warranty / Guarantee
The extent and period of warranty cover are specified in the "Standard Terms and Conditions of Albert Richter GmbH & Co. KG" valid at the time of delivery or, by way of departure, in the contract of sale itself.
We guarantee freedom of faults in compliance with state-of-the-art technology and the confirmed application.
No warranty claims can be made for any damage caused as the result of incorrect handling or disregard of operating and installation instructions, datasheets and relavant regulations. This warranty also does not cover any damage which occurs during operation under conditions deviating from those laid down by specifications or other agreements.
Justified complaints will be eliminated by repair carried out by us or by a specialist appointed by us.
No claims will be accepted beyond the scope of this warranty. The right to replacement delivery is excluded.
The warranty shall not cover maintenance work, installation of external parts, design modifications or natural wear.
Any damage incurred during transport should not be reported to us but rather to the competent cargo-handling depot, the railway company or carrier company immediately or else claims for replacements from these companies will be invalidated.
Technology for the Future.
GERMAN QUALITY VALVES
ARI-Armaturen Albert Richter GmbH & Co. KG, D-33756 Schlo? Holte-Stukenbrock Telephone (+49 5207) 994-0 Telefax (+49 5207) 994-158 or 159 Internet: https://www.wendangku.net/doc/fe5213809.html, E-mail: info.vertrieb@https://www.wendangku.net/doc/fe5213809.html,
Rev. 0040701000 0410Page 15
12.0 EC declaration of conformity
ARI-Armaturen Albert Richter GmbH & Co. KG,
Mergelheide 56-60, D-33756 Schlo? Holte-Stukenbrock
EC declaration of conformity
as defined by
the Pressure Equipment Directive 97/23/EC
Herewith we declare,
that according to the above mentioned Pressure Equipment Directive (PED) the below listed prod-ucts comply and have been approved according to table 6, annex II, module H through Lloyd′s Reg-ister Quality Assurance GmbH (BS-No. 0525), Am Sandtorkai 41, D-20457 Hamburg.
Certificate-No: 50003/1
Pressure reducing valves
PREDU?
Type 701
Applied standards:
DIN EN 60534 part 1
DIN 3840
AD 2000 leaflet A4
- Cast iron with spheroidal graphite
- Cast steel
Schlo? Holte-Stukenbrock, 11.01.2010
.................................................
(Brechmann, Managing director)
Page 16Rev. 0040701000 0410
减压阀规范、标准
水用减压阀 第一部分 1.0概要 1.1应用 水用减压阀主要应用于降低配水系统中静态与动态（流动）水压。 1.2 适用范围 1.21 类型描述 本标准中的水用减压阀为独立、直动（直接动作）、单膜片式。允许内附过滤网，或在减压阀入口处连接一个独立的过滤装置，或者也可以不安装过滤网及过滤装置。减压阀可以内附旁通阀（by-pass relief valve）装置，也可以不附加旁通阀。 1.22 尺寸范围 连接管路通径的范围为 DN15, DN20,DN25,DN32,DN40,DN50,DN65 和DN80。依据美国国家螺纹管标准ASME B1.20.1，对应的管螺纹为（1/2 NPT,5/8NPT,1-1/4NPT,1-1/2NPT,2NPT,2-1/2NPT 和3NPT） 1.23 压力范围 水用减压阀最小工作压力为1724 kPa（250 psi） 1.24 温度范围 水用减压阀设计的最小温度范围为：0.6°C （33°F）至 60°C（140°F） 1.3 设计限制 1.31 减压阀中的各个部件能够抵抗由特定水压试验产生的应力，不出现永久变形。并且也可以抵御 在水压不平衡的特殊工作条件下，由工作水压力所产生的应力。见3.6节。 1.32 机械性能 1.3. 2.1 可修复性 (a)减压阀的内部零件或者滤网（如果内附其中）应易于检查、清洗、维修或更换。做上述检查或维 修时，无需从管路中拆卸下减压阀。 (b)减压阀中可更换的零件，必须保证，同型号同尺寸的零件具有可互换性。 1.4 参考标准 参考 ANSI、ASTM、ASME 和 ISO最新版本的标准。 第二部分 2.0 试样 2.1 提交测试的样本 每种规格要提供三个样品。任意挑选其中的一个进行测试。 2.2 样本测试 测评机构将选取每一种类型，每一种规格的减压阀，分别进行全部试验。 2.3 图纸 装配图和其他必要的数据，以及产品安装图纸，要随样品一起提交给测试机构，保证测试机构可以判断样品是否符合标准。 2.4 不合格样品 选中样品若未通过测试试验，则认为同类型同规格的产品为不合格品，直到制造商提供改正后的新样品重新进行测试试验。 第三部分 3.0 性能符合性测试 3.1 耐压试验#1（静压内漏测试）
活塞式减压阀使用说明
Y43H-16C活塞式减压阀使用说明 本阀适用于蒸汽介质管路上，通过调节将进口压力降低至某一需要的出口压力，当进口压力与流量有变化时，靠介质本身能量可自动保持出口压力在一定范围内，但进口压力和出口压力之差必须≥0.2MPa/cm2。 一、安装与使用 1.安装减压阀之前必须对管路系统进行冲洗清理，以防焊渣、氧化皮等赃物流入阀内，影响阀门正常工作。 2.减压阀应安装在便于操作和维修的地方，并且必须直立安装在水平管路上，应注意管路中介质的流向与阀体上箭头所示方向一 致，切勿装反。 3.减压阀在安装使用时，应先把旁通管路上的截止阀打开，排除管路中的冷凝水和汽水混合物，以防减压阀开启时产生水击现象 损坏减压阀；当无异常现象后，按顺时针方向缓慢旋转调节螺钉，将出口压力调至所需压力（以阀后表为准），调整好后，将锁紧螺母背面，拧上防护罩。 4.减压阀前应安装过滤器，以防止介质中的杂质进入减压阀，影响其性能。 5.安装的减压阀前后应有一段直管，阀前直管长度约为600mm，阀后直管长度约为1000mm。 二、维护与检修 1.减压阀应存放在干燥的室内，通路两端必须用盲板堵塞，不准堆置存放。 2.长期存放的减压阀应定期检查，清洗污垢，在各运动部位及加工面上应涂以防锈剂，防止生锈。
三、故障与消除方法
四、如出口压力高于所需压力，需要重新设定，方法如下： ①关闭上游隔离阀； ②把出后压力泄掉； ③将导阀调节螺钉逆时针旋松，使调节弹簧处于自由状态； ④慢慢开启上游隔离阀至全开； ⑤顺时针慢慢向下拧紧导阀调节螺钉，出后压力逐步升高，直到设定值时将调节螺母锁定； ⑥如果调压过头，须从第一步开始重新调节，即只能从低压往高压调。
可调式减压阀说明书
可调式减压阀说明书 Prepared on 22 November 2020
Y X 741X - 可调式减压阀 使 用 说 明 书 株洲南方阀门股份有限公司 一、用途 安装在供水管网上，将较高的上游压力降为符合使用要求的下游工作压力。无论上游压力和流量如何改变，预定的下游压力都能保持恒定不变。 二、特点 1、减压稳压效果好。外设独立的压力反馈系统，利用液压原理进行控制。出口压力不受进口压力及流量变化的影响，既可减动压，又可减静压。 2、操作维护方便。只需调节先导阀的调节螺栓，就能获得精确稳定的出口压力，关键零件均采用优质材料，基本无需维护。 3、过流面积大，阻力损失小。采用流线型、宽阀体设计。 4、在压力降低较大的场所下，可采用特殊阀板设计，减少噪声和振动。 三、技术参数 1、公称压力： 2、出口压力：调节范围 ~ 调节范围 ~ 调节范围 ~ 调节范围 ~ 3、适用介质：清水 4、适用温度：0~80℃ 四、结构示意图 减压阀是由主阀和导阀控制系统组成。主阀由阀体、膜片、阀杆、阀板等主要零件组成；导阀控制系统由闸阀、减压导阀、过滤器、压力表、调节阀、附管组成。 图一 结构原理图 1、闸阀 2、过滤器 3、先导阀 4、压力表 五、工作原理 可调式减压阀是通过出口压力的变化反馈到导阀上，再由导阀来控制主阀板的开度，使预定的下游压力保持不变。 10 16 25 40
当出口压力大于导阀的设定值时，出口压力水从控制管进入导阀膜片下腔内，推动导阀阀杆上移，导阀阀板开度减小，从而导致从控制管进入导阀再到主阀控制室上腔的压力水的压力升高，推动阀杆下移，主阀板的开度随之减小，阀后压力降低。 当出口压力小于导阀的设定值时，导阀膜片下腔的压力降低，导阀阀杆下移，其阀板开度增大，进口压力水从控制管进入导阀再到出口端，使主阀上腔压力降低，主阀板的开度随之增大，阀后压力增高。 六、安装注意事项 1、安装前需冲洗管道。 2、阀体的箭头必须与管内的实际流动方向一致。 3、最佳阀门安装——卧式或其它可接受的方式。 4、先导式减压阀前后须装隔离阀（检修阀）。 5、留出足够的工作空间。 6、当减压比大于4：1时，建议二级串联减压，减小气蚀延长寿命。 7、要求在阀前加装过滤器，定期清洗。 8、当阀前后压差小于时请用户在合同上说明。 七、调试步骤(见安装示意图) 1、关闭上下游隔离阀1、3。 2、打开控制管上的闸阀5。 3、将减压阀2上的先导阀调节螺栓完全拧松，并打开上、下腔排气阀4。 4、缓慢打开上游隔离阀1，逐渐排尽上、下腔气体，关闭上腔排气阀，检查阀后压力是否为零。 5、如下腔一直出水，阀后压力不为零，则将先导阀下端微调螺栓拧松数圈并打开下游隔离阀3，直到阀后压力为零，关闭下游隔离阀3。 6、将先导阀下端微调螺栓紧到底再退1～圈。 7、将减压阀2上的先导阀调节螺栓逐渐拧紧，同时观察阀后压力达到要求为止。（如调过头则从步骤3重调）。 8、缓慢打开下游隔离阀3，检查阀后压力，如压力降低则适当拧紧先导阀调节螺栓，反之则适当拧松先导阀调节螺栓，直到动压与调定静压相符为止。 9、缓慢关闭下游隔离阀3，检查阀后压力，如压力高于原调定压力，则将减压阀2上先导阀的调节螺栓退到底，再打开下游隔离阀3，阀后压力为零后，关闭下游隔离阀3，从步骤7开始重调。 10、总之，要在静态时从低往高调。
减压阀英文说明书
The Piston-type Steam pressure reducing valve Instruction manual Configurations: Main performance and uses: Y43H is principally used in steam pipe, it can reduce the inlet pressure to a certain outlet pressure you need by adjusting the spring, when the flow and the pressure of the inlet varies, the outlet pressure can also remain within a certain range by the strength of the medium itself, but the differential pressure of the inlet and outlet must be equal or greater than 0.2MPa. Technical parameter: Working principal:
When the pressure reducing valve leaves the factory, the adjusting spring is in uncompressed state, the main valve disc and secondary valve disc is in close position. When you want to use it, you can turn the adjusting screw clockwise; this can compress the adjusting spring, move the diaphragm down and then open the secondary valve disc, the medium also enters above the main valve seat through “a”hole to “b”hole, make the main valve disc open and then enters under the diaphragm through “c” hole. But when the downstream pressure is exceed the set pressure, the medium moves the diaphragm up and compresses adjusting spring, and then the secondary valve disc closes slowly, because the flow reduces, the downstream pressure get a new balance, on the other hand, when the downstream pressure is less than the set pressure, the gap between the main valve disc and the main valve seat increases and then the flow increases too and then make the downstream pressure get a new balance. Installation and maintenance: 1.Clean the valve and the pipe line and remove the dirt before installation, at the same time the valve must be installed in horizontal direction, bracket is needed when the valve deadweight is heavy or vibration exists at the site. 2.While installing, make sure the flow direction and the
气体钢瓶减压阀工作原理及使用方法
在物理化学实验中，经常要用到氧气、氮气、氢气、氩气等气体。这些气体一般都是贮存在专用的高压气体钢瓶中。使用时通过减压阀使气体压力降至实验所需范围，再经过其它控制阀门细调，使气体输入使用系统。 1.氧气减压阀的工作原理 最常用的减压阀为氧气减压阀，简称氧气表。 氧气减压阀的外观及工作原理见图Ⅱ-2-7和图II-2-8。 氧气减压阀的高压腔与钢瓶连接，低压腔为气体出口，并通往使用系统。高压表的示值为钢瓶内贮存气体的压力。低压表的出口压力可由调节螺杆控制。 使用时先打开钢瓶总开关，然后顺时针转动低压表压力调节螺杆，使其压缩主弹簧并传动薄膜、弹簧垫块和顶杆而将活门打开。这样进口的高压气体由高压室经节流减压后进入低压室，并经出口通往工作系统。转动调节螺杆，改变活门开启的高度，从而调节高压气体的通过量并达到所需的压力值。 减压阀都装有安全阀。它是保护减压阀并使之安全使用的装置，也是减压阀出现故障的信号装置。如果由于活门垫、活门损坏或由于其它原因，导致出口压力自行上升并超过一定许可值时，安全阀会自动打开排气。 2.氧气减压阀的使用方法 (1)按使用要求的不同，氧气减压阀有许多规格。最高进口压力大多为15MPa ，最低进口压力不小于出口压力的2.5倍。出口压力规格较多，一般为0.25 MPa 最高出口压力为4 MPa (2)安装减压阀时应确定其连接规格是否与钢瓶和使用系统的接头相一致。减压阀与钢瓶采用半球面连接，靠旋紧螺母使二者完全吻合。因此，在使用时应保持两个半球面的光洁，以确保良好的气密效果。安装前可用高压气体吹除灰尘。必要时也可用聚四氟乙烯等材料作垫圈。 (3)氧气减压阀应严禁接触油脂，以免发生火警事故。 (4)停止工作时，应将减压阀中余气放净，然后拧松调节螺杆以免弹性元件长久受压变形。 (5)减压阀应避免撞击振动，不可与腐蚀性物质相接触。 3.其它气体减压阀 有些气体，例如氮气、空气、氩气等永久性气体，可以采用氧气减压阀。但还有一些气体，如氨等腐蚀性气体，则需要专用减压阀。市面上常见的有氮气、空气、氢气、氨、乙炔、丙烷、水蒸气等专用减压阀。 这些减压阀的使用方法及注意事项与氧气减压阀基本相同。 一.开启 当正确地将减压器安装在气瓶阀上并开气瓶阀后，顺时针转动调节螺杆14，压缩调节弹簧13, 传动弹簧垫块1，传动薄膜2和顶杆12，从而使活门10离开阀座。进口的高压气体由高压室9经活门和阀座的节流间隙进入低压室11扩散减压。高压室的压力分
200X减压阀说明书及及故障排除方法
200X减压稳压阀 一、结构特点和用途 200X减压稳压阀由主阀、导阀、针阀、球阀、微型过滤器和压力表组成水力控制接管系统。使用时，当调定出口压力后，能自动保持稳定出口压力。 本产品利用导阀自力控制，不需要其它装置和能源，保养简便，压力控制准确度高，受进口压力和流量影响小，减压稳压可靠。 本系列阀门产品广泛用于高层建筑、生活区等供水管网系统及城市供水工程。 二、工作原理 当阀门从进口端给水时，水流过针阀进入主阀控制室，出口压力通过导管作用到导阀上。当出口压力高于导阀弹簧设定值时，导阀关闭。控制室停止排水，此时主阀控制室内压力升高并关闭主阀，出口压力不再升高。 当阀门出口压力降到导阀弹簧设定压力时，导阀开启，控制室向下游排水。由于导阀系统排水量大于针阀的进水量，主阀控制室压力下降。进口压力使主阀开启。在稳定状态下，控制室进水、排水相同，主阀开度不变，出口压力稳定。 调节导阀弹簧即可设定出口压力。 三、减压阀技术参数： 1、公称压力：1.0MPa、1.6MPa、2.5MPa 2、壳体试验压力：P=1.5PN 3.密封试验压力：P=1.1PN 4、出口压力：PN1.0MPa调节阀0.09~0.8MPa PN1.6MPa调节阀0.10~1.2MPa PN2.5MPa调节阀0.15~1.6MPa 5、适用介质：水 6、适用温度：80℃
四、减压阀的工作原理： 当阀门从进口端给水时，水流过针阀进入主阀控制室，出口压力通过导管作用到导阀上。当出口压力高于导阀弹簧设定值时，导阀关闭。控制室停止排水，此时主阀控制室内压力升高并关闭主阀，出口压力不再升高。 当阀门出口压力降到导阀弹簧设定压力时，导阀开启，控制室向下游排水。由于导阀系统排水量大于针阀的进水量，主阀控制室压力下降。进口压力使主阀开启。在稳定状态下，控制室进水、排水相同，主阀开度不变，出口压力稳定。 调节导阀弹簧即可设定出口压力。 五、水利控制阀阀设计选用要点 （ 1 ）工程式中应用的水力控制阀是经过制造厂检验合格，各种标识齐全，技术资料符合要求的产品。 （ 2 ）根据功能要求，选择阀门种类，再根据管道输送介质、温度、建筑标准和业主要要求等，确定阀门的阀体和密封部位的材质。常用的阀体材料有铸铁、铜铁、铜、塑料等。常用的密封面和衬里材料有铜合金、塑料、钢、硬质合金、橡胶等。阀体材料应与管道材料相匹配。 （ 3 ）阀门的公称压力有0.6、1.0、1.6、2.5和4.0MPa等不同级别，管道输送的介质，其工作压力应小于阀门的公称压力值。 （ 4 ）工程中水力控制阀的设置应当有足够的空间，以便管理、操作、安装和维修，并应符合管路对阀门的要求。 （ 5 ）管路采用法兰连接时，应采用法兰连接的水力控制阀；管路采用沟槽式连接时，应采用沟槽式连接的水力控制阀。 （ 6 ）水利控制阀应设置在介质单向流动的管路上。 （7 ）水利控制阀主阀体上的箭头方向必须与管路系统流向一致。 （8 ）接水力控制阀管段不应有气堵、气阻现象。在管网最高位置等存气段应设置自动排气阀。 （9 ）阀门水平安装时，阀盖、阀杆应朝上。垂直安装时，阀盖、阀杆应朝外。 （10 ）阀门安装前应做强度和严密性试验。 （11 ）阀门的强度和严密性试验应符合以下规定。 A、阀门的强度试验压力为公称压力的1.5倍； B、阀门的严密性试验压力为公称压力的1.5倍； C、试验压力在试验持续时间内应保持不变，且壳体填料及阀瓣密封面无渗漏； D、阀门试验持续时间按上表。
可调式减压阀说明书
Y X 741X- 可调式减压阀 使 用 说 明 书 株洲南方阀门股份有限公司 10 16 25 40 ○ R
一、用途 安装在供水管网上，将较高的上游压力降为符合使用要求的下游工作压力。无论上游压力和流量如何改变，预定的下游压力都能保持恒定不变。 二、特点 1、减压稳压效果好。外设独立的压力反馈系统，利用液压原理进行控制。出口压力不受进口压力及流量变化的影响，既可减动压，又可减静压。 2、操作维护方便。只需调节先导阀的调节螺栓，就能获得精确稳定的出口压力，关键零件均采用优质材料，基本无需维护。 3、过流面积大，阻力损失小。采用流线型、宽阀体设计。 4、在压力降低较大的场所下，可采用特殊阀板设计，减少噪声和振动。 三、技术参数 1、公称压力：1.0MPa 1.6MPa 2.5MPa 4.0MPa 2、出口压力：PN1.0MPa调节范围0.1~0.8Mpa PN1.6MPa调节范围0.2~1.4Mpa PN2.5MPa调节范围0.3~2.0Mpa PN4.0MPa调节范围1.0~3.5Mpa 3、适用介质：清水 4、适用温度：0~80℃ 四、结构示意图 减压阀是由主阀和导阀控制系统组成。主阀由阀体、膜片、阀杆、阀板等主要零件组成；导阀控制系统由闸阀、减压导阀、过滤器、压力表、调节阀、附管组成。 图一结构原理图 1、闸阀 2、过滤器 3、先导阀 4、压力表
五、工作原理 可调式减压阀是通过出口压力的变化反馈到导阀上，再由导阀来控制主阀板的开度，使预定的下游压力保持不变。 当出口压力大于导阀的设定值时，出口压力水从控制管进入导阀膜片下腔内，推动导阀阀杆上移，导阀阀板开度减小，从而导致从控制管进入导阀再到主阀控制室上腔的压力水的压力升高，推动阀杆下移，主阀板的开度随之减小，阀后压力降低。 当出口压力小于导阀的设定值时，导阀膜片下腔的压力降低，导阀阀杆下移，其阀板开度增大，进口压力水从控制管进入导阀再到出口端，使主阀上腔压力降低，主阀板的开度随之增大，阀后压力增高。 六、安装注意事项 1、安装前需冲洗管道。 2、阀体的箭头必须与管内的实际流动方向一致。 3、最佳阀门安装——卧式或其它可接受的方式。 4、先导式减压阀前后须装隔离阀（检修阀）。 5、留出足够的工作空间。 6、当减压比大于4：1时，建议二级串联减压，减小气蚀延长寿命。 7、要求在阀前加装过滤器，定期清洗。 8、当阀前后压差小于0.2MPa时请用户在合同上说明。 七、调试步骤(见安装示意图) 1、关闭上下游隔离阀1、3。 2、打开控制管上的闸阀5。 3、将减压阀2上的先导阀调节螺栓完全拧松，并打开上、下腔排气阀4。 4、缓慢打开上游隔离阀1，逐渐排尽上、下腔气体，关闭上腔排气阀，检查阀后压力是否为零。 5、如下腔一直出水，阀后压力不为零，则将先导阀下端微调螺栓拧松数圈并打开下游隔离阀3，直到阀后压力为零，关闭下游隔离阀3。 6、将先导阀下端微调螺栓紧到底再退1～1.5圈。 7、将减压阀2上的先导阀调节螺栓逐渐拧紧，同时观察阀后压力达到要求为止。
气体钢瓶减压阀工作原理及使用方法(正式)
编订：__________________ 单位：__________________ 时间：__________________ 气体钢瓶减压阀工作原理及使用方法(正式) Standardize The Management Mechanism To Make The Personnel In The Organization Operate According To The Established Standards And Reach The Expected Level. Word格式 / 完整 / 可编辑
文件编号：KG-AO-8673-67 气体钢瓶减压阀工作原理及使用方 法(正式) 使用备注：本文档可用在日常工作场景，通过对管理机制、管理原则、管理方法以及管理机构进行设置固定的规范，从而使得组织内人员按照既定标准、规范的要求进行操作，使日常工作或活动达到预期的水平。下载后就可自由编辑。 在物理化学实验中，经常要用到氧气、氮气、氢气、氩气等气体。这些气体一般都是贮存在专用的高压气体钢瓶中。使用时通过减压阀使气体压力降至实验所需范围，再经过其它控制阀门细调，使气体输入使用系统。最常用的减压阀为氧气减压阀，简称氧气表。 1.氧气减压阀的工作原理 氧气减压阀的高压腔与钢瓶连接，低压腔为气体出口，并通往使用系统。高压表的示值为钢瓶内贮存气体的压力。低压表的出口压力可由调节螺杆控制。
使用时先打开钢瓶总开关，然后顺时针转动低压表压力调节螺杆，使其压缩主弹簧并传动薄膜、弹簧垫块和顶杆而将活门打开。这样进口的高压气体由高压室经节流减压后进入低压室，并经出口通往工作系统。转动调节螺杆，改变活门开启的高度，从而调节高压气体的通过量并达到所需的压力值。 减压阀都装有安全阀。它是保护减压阀并使之安全使用的装置，也是减压阀出现故障的信号装置。如果由于活门垫、活门损坏或由于其它原因，导致出口压力自行上升并超过一定许可值时，安全阀会自动打开排气。 2.氧气减压阀的使用方法 (1)按使用要求的不同，氧气减压阀有许多规格。最高进口压力大多为，最低进口压力不小于出口压力的2.5倍。出口压力规格较多，一般为，最高出口压
自力式减压阀说明书
ZZYP型 自力式减压阀运行维护手册
ZZYP型自力式减压阀 一、用途与特点 ZZYP型自力式减压阀（简称调压阀）是利用被调介质自身能量实现自动调节的执行器产品。该产品最大特点，能在无电、无气的场所工作，是一种节能产品。压力设定值可在运行中随意调整。常规产品采用快开流量特性，亦可采用线性、等百分比流量特性。动作灵敏，减压比一般情况下最大可达10，最小为1.25，广泛应用于石油、化工、电力、冶金、食品、轻纺、居民楼群等各种工业设备中的气体、液体、蒸汽等介质低压差减压、稳压（用于控制阀后压力），或泄压、稳压（用于控制阀前压力）的自动控制。 二、结构与原理 1、结构（图1） 调压阀主要由执行机构、调节机构、导压管与接管等四部分组成。执行机构有薄膜式（用于被调压力≤0.6Mpa）、活塞式（用于被调压力＞0.6Mpa）、波纹管式（用于高温或腐蚀性流体），调节机构为单座(波纹管平衡)型式(控制压力≤1.0MPa)。 产品外形图 图1 2、原理（图2） 图2a结构为单座式，阀后压力控制，初始状态常开。原理：介质由箭头方向进入阀体，经阀芯、阀座节流后输出。另一路经冷凝器（介质为蒸汽时使用）冷却后，引入执行机构膜室，其压力作用在膜片有效面积上产生一个推力，带动阀杆、阀芯位移，使节流口面积发生变化，达到减压稳压目的。若阀后压力
高于设定值，则作用在膜片上的力增大，压缩弹簧，带动阀芯位移，减小调压阀开度，直至阀后压力下降到设定值。同理，若阀后压力低于设定值，由于弹簧反作用力，带动阀芯位移，增大调压阀开度，直至阀后压力上升到设定值 图2b结构为单座式，阀前压力控制，初始状态常闭。原理：介质由箭头方向进入阀体，另一路经冷凝器（介质为蒸汽时使用）冷却后，引入执行机构膜室，其压力作用在膜片有效面积上产生一个推力，带动阀杆、阀芯位移，使阀门开启度增大，若阀前压力高于设定值，则作用在膜片上的力增大，压缩弹簧，带动阀芯位移，增大调压阀开度，直至阀前压力下降到设定值。同理，若阀前压力低于设定值，由于弹簧反作用力，带动阀芯位移，减小调压阀开度，直至阀前压力上升到设定值。 图2 三、主要参数、性能指标与材料
减压阀安装维护说明
Rev. 0040701000 0410 englisch 1.0 General information on operating instructions.....................................................22.0 Notes on possible dangers (2) 2.1Significance of symbols (2) 2.2Explanatory notes on safety information.................23.0 Storage and transport ..................................34.0 Description.....................................................34.1Scope of applications..............................................34.2Operating principles................................................34.3Diagram ..................................................................44.4Parts .......................................................................44.5Technical data - remarks.........................................54.6Marking (6) 5.0 Installation (7) 5.1General notes on installation...................................75.2Requirements at the place of installation................85.3Installation instructions concerning actuators (8) 5.4Control line, flow restrictor, water seal pot..............95.5System arrangement - pressure reducing station 105.6Strainer .................................................................115.7Safety valves (11) 6.0 Putting the valve into operation (11) 7.0 Care and maintenance................................128.0 Troubleshooting..........................................129.0 Troubleshooting table ...............................1310.0 Dismantling the valve or the top part .....1511.0 Warranty / Guarantee................................1512.0 EC declaration of conformity. (16) Operating and installation instructions Pressure reducing valve PREDU ? Contents PREDU (Series 700)