The C3 pressure reducing valves are direct acting nozzle design, which are suitable for use on compressed air, gas, water, oil and steam. These valves are used in a variety of applications throughout industry, where their outstanding accuracy and reliability have been proven. Valves are supplied in sizes one and half inch to four inch in Gunmetal with ends screwed female or alternatively flanged to customers requirements.
Inlet pressures of up to 250 psig for steam and 300 psig for air and liquid service can be accommodated, although up to 600 psig can be achieved using a reduced orifice and screwed ends. (Consult Broady Technical Sales Engineers for further information). Reduced pressure ranges of 5 to 120 psig are possible.
Specification
Pressure gauge bosses are cast on each side of the valve and tapped to customers requirements. Suitable strainers, pressure gauges, syphon pipes and cocks can be supplied when required. All valves are supplied with a nitrile disc and diaphragm for air, gases, oils, etc. as standard, but other materials are available on request. Valves for steam service are supplied with a metallic diaphragm and lid for steam and high temperature applications.
Description of Action
High pressure steam is admitted to the underside of the main valve and relay valve. By compressing the main spring the relay valve opens, allowing regulated pressure on top of the main piston which in turn opens the main valve lid, allowing reduced pressure through. This pressure is then transmitted through the port in the outlet side acting on the underside of the diaphragm. Any build up in reduced
pressure deflects the diaphragm allowing the relay valve to close, thus shutting off regulated steam to the main piston which in turn closes the main valve assisted by the loading spring.
When the correct reduced pressure is restored the valves open again as previously described. Compressing the spring increases the reduced pressure, relaxing the spring decreases the reduced pressure.
Installation Instructions
All valves should be fitted in a horizontal pipeline with, flow in the direction of the arrow cast on the side of the body. The adjusting screw should be directly above or below the pipeline. The pipe must be clean and free from dirt, scale, etc. It is advisable to fit a stop valve on the high pressure side of the line. A relief valve should always be fitted where dead end conditions apply. This can be combined with the reducing valve but we recommend that it be fitted in a convenient point in the reduced pressure line.
Maintenance Information
Please see PDF datasheet.
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Broady Flow Control Limited
English Street, Kingston upon Hull, East Yorkshire, HU3 2DU
Tel: 44 (0) 1482 619601 Fax: 44 (0) 1482 619701
