Zero Governor Regulator BZR-Electric Gas Lok | Selas
The Selas BZR Electric Gas-Lok is a modification of the Zero Governor enabling its use as both a precision balanced regulator and operating shutoff valve.
The Gas-Lok Zero Governor is shipped ready to install, assembled as shown in Figure 1 (below). The impulse hole (A) is closed at the factory. Port #1 of the three-way solenoid valve connects to the outlet end of the valve body. Port #2 is connected on the job to the main gas line ahead of all automatic control valves. Tubing is supplied for this connection. Port #3 connects to the lower diaphragm chamber of the Governor.
The Gas-Lok operates as a true zero governor when the solenoid is energized, opening Port #1 and Port #3. This allows the outlet pressure to be referred to the main diaphragm chamber (B). When the electric circuit is broken by a control device, the Gas-Lok operates as a cut-off valve. Port #1 closes and Port #2 opens. This allows gas flow from the line to the lower diaphragm chamber. The resulting increase in pressure under the main diaphragm (B) holds the valve tightly shut.
Dimensions
Disclaimer
The Gas-Lok zero governor is NOT an approved safety shut-off valve and should not be used to shut-off the main gas flow in the event of a flame failure. In this case, use a Manual Reset Valve (Refer to Bulletin 1101) to shut-off the main gas flow.
