B177 Differential Bypass Valves

The model B177 is low-pressure build-up bypass valve designed for applications that require protection for positive displacement pumps. It is ideal for capacities ranging from 100 to 350 gpm (22.7 to 79.5 m3/hr). It can also be used as a differential back-pressure valve that assures adequate pressure on meters. To function properly, this valve requires a pressure sensing line from the storage tank. Available in 2" and 2-1/2" sizes.
Typical Application: Used in liquefied gas bulk-plant installations utilizing loading and unloading pumps.
 
Connections: 2” or 2-1/2” inlet/outlet 
Differential pressure range: 10 – 125 psi (.7 – 8.6 bar) 
Maximum working pressure: 400 psig (27.6 bar g) 
Capacities up to 390 gpm (1,476 l/min)
Thread type: NPT or weld neck