In the case of steam and liquids the sense line must be installed so as to fall towards the valve. Under special operating conditions, for example intermittent operation with dry steam, an compensation vessel must be installed. The sense line must be rigid as elastic hoses can induce oscillations.

With medium steam, the pressure reducer should be preceded by a water trap, which is also called steam dryer, to protect it from cavitation (see below chapter "Steam Operation").

If the available setting range is not wide enough you may go below the bottom limit of the setting range provided that the valve loading is kept low and a high control accuracy not required

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In some cases an insulating of the body is permitted, but only with cast bodies. Never insulate diaphragm housing, mid section and spring cap (or open springs). Overheating caused by insulating destroys the elastomere of the control unit.

Any low leakage requirement must be expressly specified when ordering. Valve leakage can be considerably reduced by special measures such as lapping the valve seat, using special cone seals and increasing the control (diaphragm) surfaces.

Pressure reducing valvediagram

Liquids: 1 - 5 m/sSaturated steam: 10 - 40 m/sSuperheated steam: 15 - 60 m/sGases below 2 bar: 2 - 10 m/sGases above 2 bar: 5 - 40 m/s

You should also note the reduction ratio i.e. inlet pressure p1 divided by outlet pressure p2. The inlet pressure acting on the cone causes the valve to open whereas the outlet pressure acting on the diaphragm/spring system causes it to close. If the reduction ratio calculated from the operating data is greater than the quoted ratio, the valve will not close. Pressure reducing valves should not be overdimensioned. Their optimum working range is within 10 % to 70 % of their Kvs value.

Hydraulicpressure reducing valveworking principle

If a pressure reducer is installed in a steam plant the diaphragm water reservoir must be filled before the plant is started up. There must be no danger of overheating at the installation site caused by excessive ambient temperatures or insufficient heat dissipation. Pressure regulators must not be insolated.

The rated pressure must exceed the maximum system pressure, irrespective of safety allowances. Please note also the effect of the temperature (see DIN 2401).

You should install a sense line if the selected pressure reducer is designed for sense line operation. The sense line should be connected at a distance of not less than 10 times nominal diameter downstream of the pressure reducing valve. No isolating valves should be installed in the sense line to avoid an excessive pressure differential between valve body and diaphragm.

Pressure reducing valves reduce a high and frequently fluctuating pressure to an adjustable constant pressure downstream of the valve. A spring keeps the valve open and this closes as the outlet pressure rises.

These charts were provided courtesy of Danfoss, using their FREE CoolSelector 2 software. You can download that software free of charge also using this link.

Please consult our engineer if extreme operating conditions apply or whenever you are in doubt.Notes on Safety, Operating Instruction etc. MUST be followed.

1   Bypass for maintenance2   Shutoff Valves3   Strainer / Filter4   Pressure Gauge5   Safety Valve6   Pressure Reducer7   Sense Line8   Leakage Line

To protect your system you should install a safety valve downstream of the pressure reducer to prevent the maximum permitted operating pressure (normally 1.5 x maximum set pressure) being exceeded. The safety valve operating pressure should be set approximately 40 % above the maximum set pressure of the pressure reducer to avoid blow-off during slight pressure fluctuations. For example: if the pressure reducer setting range is 2 - 5 bar the safety valve operating pressure must be 1.4 x 5 bar = 7 bar.

Pressure reducers should be started up and operated without pressure surges, if possible. A sudden operation of upstream or downstream valves should be avoided.

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pressure reducing valve- bunnings

For gases a pressure reducing valve can normally be fitted in horizontal pipelines with the spring cap at the bottom or at the top. Installation in vertical pipe runs is possible but can result in increased wear and loss of control accuracy owing to increased friction.

You should select elastomers according to the operating temperature and the requirements of the medium. High-pressure gases, for example, can diffuse into the elastomer and cause damage when being depressurised.

In the case of liquids a pressure reducer should be installed with the spring cover at the bottom. Thus gas traps upstream of the valve are avoided which would cause the valve to oscillate.

Pressure reducing valveworking principle

These valves are no shut-off elements ensuring a tight closing of the valve. In accordance with DIN EN 60534-4 and/or ANSI FCI 70-2 they may feature a leakage rate in closed position in compliance with the leakage classes II – V:

To attenuate any oscillations occurring in the pipeline system, the sense line may be fitted with a restrictor which must never be fully closed during operation.

As part of the heart of plumbing, pipe fittings are very important to the quality of a structure's plumbing system. Knowing this, A.Y. McDonald Mfg. Co. has ...

Waterpressure Reducing Valve

A spring (optionally a gas spring or weight) keeps the valve open, the outlet pressure acts through the control element (diaphragm, piston or bellows) onto the cone and, in the event of rising outlet pressure, proportionally closes the valve. The pressure to be controlled can be adjusted by a pre-tensioned / relieved spring through an adjusting screw.

Pressure reducing valves are normally supplied by us with a relaxed spring. This means that a valve is set at the factory to the minimum outlet pressure. The required pressure should be set under operating conditions.

Pressure reducing valves reduce a high and frequently fluctuating pressure to an adjustable constant pressure downstream of the valve. A spring keeps the valve ...

Using your maximum operating data and the smallest differential pressure Δp, you should calculate the characteristic performance figure Kv (see leaflet Calculation of Pressure Regulators). Select a valve whose Kvs value is 30 % greater than the calculated Kv figure. Additional allowances must be made for high-viscosity liquids or liquids which vaporise when depressurised.

How does a Waterpressure reducing valvework animation

If toxic or hazardous media are used the valve must feature a sealed spring cap (including setting spindle seal) fitted with a leakage line connection. When the pressure reducer is installed on site a leakage line must be fitted capable of safely and pressureless draining the escaping medium in case the control valve should become defective.

28 Aug 2024 — It will ensure a safe situation exists in the event of malfunction or failure of any gas pressure regulator. Any part of the gas installation ...

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Leakage class II (metal sealing double seat cone) = 0.5% Kvs valueLeakage class III (metal sealing cone) = 0.1 % Kvs valueLeakage class IV (PTFE seal cone) = 0.01 % Kvs valueLeakage class V (soft seal cone) = 1.8 x 10-5 x Δp x D* [l/h]*D=seat diameter

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Many steam generators send a lot of water through the piping together with the steam. Even an initial overheating can get lost through piping heat losses, so that the steam gets "wet". A piping speed of up to 25 m/s is normal for "dry steam", whilst wet steam already has the effect of a sandblasting machine at this speed, and the condensate and/or the water droplets eat holes into pipings and valve seats. In addition, water obstructs heat transition especially in heat exchangers. To avoid it, the water should be removed by a water trap, also called steam dryer, as quickly as possible and without steam losses.

In the spring cap, the set pressure is generated by pressurised air acting on a diaphragm. An I/P converter regulates the control air pressure from the process control system (PLS) or from a processor in the I/P converter.

30 Sept 2021 — With regard to ASSE 1013 and ASSE 1015, a previous category of assemblies was included in the standard – double check fire protection backflow ...

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R449A Pressure Enthalpy Chart. Scroll down to find download buttons for pressure enthalpy charts in either Metric or Imperial Units. Downloads as a PDF

For steam a pressure reducer should likewise be installed with its spring cover at the bottom to protect the diaphragm against overheating by means of a layer of condensate. In case the valve must be emptied completely during operation (angle valves), it must be installed with the spring cap pointing upwards.

To protect the pressure reducer against damage from solid particles carried in the pipeline, a strainer or filter should be fitted and serviced at regular intervals.

Pressure relief valves are designed to open when they are exposed to a pressure level beyond the boiler's specified safe limits. Different boiler designs ...

For good control accuracy you should select a setting range which places the required outlet pressure near its upper limit. If, for example, the controlled outlet pressure is to be 2.3 bar, you should select the 0.8 to 2.5 bar setting range, not 2 to 5 bar.

Simply stating 'oil and grease-free' is not sufficient for target-oriented installation. Therefore, when making inquiries and placing orders, please also specify the application for correct selection of the replacement lubricant.

Functionof pressure reducing valvein hydraulic system

Radiant Heating is one of the largest and most respected suppliers of heated towel rails, electric underfloor heating, ...

Pressure reducing valveworking principle pdf

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It is essential to ensure that spare and wear parts, that are reordered and installed, are free of oil, grease and silicone.

In all areas where explosive atmospheres may be present, devices and protective systems must be selected according to the device group and the EPL in accordance with the ATEX Directive 2014/34/EU.

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For the purpose of installation, servicing and isolation of the valve, shut-off valves should be installed upstream and downstream of the pressure reducer. When closing the shut-off valves the upstream valve must always be closed first. A bypass line may be necessary to maintain emergency operation.

This video shows an example on how to remove or replace the part on a typical machine, some models may be different but the procedure should be similar.

Rich History. For more than 130 years, Clow Valve has been servicing its customers as one of the United States' premiere manufacturers of iron valves and ...

Our valves are also available in oil-free, grease-free and silicone-free versions. However, some structural parts must be lubricated to ensure product function. Special lubricants are available for this, depending on the application. For example, a different lubricant is used for a food or pharmaceutical application than for an oxygen application.

In the case of abrasive media or liquids with pressure drops (inlet pressure minus outlet pressure) of more than 25 bar the valve cone must be stellited; for pressure drops above 150 bar the seat must be stellited as well.

Protects all the devices, valves and installations situated downstream from excessive pressure build-up, simultaneously the consumption is reduced and the flow velocity and noise are minimised.