A hydraulically operated pilot controlled modulating type pressure relief valve is design to maintain constant up stream pressure and to minimize surging. Installed on a by-pass line, mainline pressure is accurately controlled by relief excess pressure. This valve can be used for pressure relief, back pressure, up stream pressure control and many more. Installed in a mainline it prevents upstream pressure from dropping (sustain) below present minimum
| Size | 25NB - 400NB |
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