Type B2 Pressure Reducing Valve |
| Product Overview |
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The B2 pressure reducing valves combines high capacity with attendant high accuracy of reduced pressure for steam and gases. 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 half inch to six inch in SG Iron with ends screwed female or alternatively flanged to customers requirements. Inlet pressures of up to 27.60 Barg for steam and 34.50 Barg for air service can be accommodated, although up to 41.40 Barg can be achieved using a Carbon Steel valve. (Consult Broady Technical Sales Engineers for further information). Reduced pressure ranges of 0.34 to 17.20 Barg are possible. For reduced pressures of 0.07 to 0.34 a low pressure top is necessary. (Consult Broady Technical Sales Engineers for further information).
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| Specification |
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Contact Sales for more information
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| Description of Action |
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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.
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| Installation Instructions |
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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 pipeline. The pipe must be clean
and free from dirt, scale, etc. A fine strainer should be fitted on the upstream side of the valve and a relief valve of adequate size fitted on the downstream side. Stop valves and pressure gauges fitted
where required. A balance pipe should be fitted when the valve is working under difficult conditions (e.g. when the reduced pressure is less than 10% of the inlet pressure). It is important that the lower port is blanked off without restricting the upper port. This is done by inserting a balance pipe connection. This is tapped three eights inch BSP. The balance pipe should be arranged with a fall, this allows it to drain into the downstream pipe (approx. 2 to 3 metres).
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| Maintenance Information |
Stop valve on the high pressure side should be fully open and the stop valve on the reduced pressure side just `cracked’. Relax the main spring by rotating the adjusting screw anti-clockwise, the reduced pressure should be zero under these conditions. When condensate has cleared, close the downstream stop valve. Rotate the adjusting screw clockwise slowly until the reduced pressure is reached. If the first setting is too high, remove load on the spring and vent the outlet by opening and closing the stop valve. The valve can also be set with the downstream stop valve open, but this is not as accurate as the dead end procedure above.
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| Download the Datasheet here: |
Download the IOM here: |
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Type_B2.pdf
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| Product Image |
