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Axelson CRBBM Relay

crbbm relay made by Axelson

Axelson CRBBM Relay

Manual or Automatic Reset Relays

OPERATION: With control (actuator) supply connected to the supply pressure inlet and no instrument pressure at pilot pressure inlet, control pressure is blocked at the supply pressure inlet and the supply pressure outlet is open to the exhaust ports (radial holes in body).

When instrument pressure is applied to the pilot pressure inlet of the relay, it acts against the relay piston, shifting it to an open position.  This allows control pressure to pass from the supply pressure inlet through supply pressure outlet to open the SSV safety valve.  It will remain in the position until instrument pressure is bled from the pilot pressure inlet.

Once the PSHL blocks and bleeds pressure from the pilot pressure inlet, the relay spring will force the relay piston downward to its block and bleed position, blocking  control pressure at the supply pressure inlet and opening the supply pressure outlet to exhaust, allowing the SSV safety valve to close.

The Relay will remain closed until instrument supply is readmitted to the pilot pressure inlet.  Once instrument pressure is readmitted to the pilot pressure inlet, the relay will shift automatically to its open position.

The CRBBM and CRBBM-1 Relays are identical with the
exception that the -1 body is drilled and tapped for panel mountings. All other parts of the assembly are interchangeable.

 

TECHNICAL DATA:
Maximum Working Pressure:  
250 psi
Pilot Pressure: 
35 to 150 psi*
Length: 
7 1/4 in.
Connections: 
1/4 NPT
Weight: 
2 3/4 lbs.
Material: 
All corrosion resistant

DESIGN OVERVIEW:
The relay is normally-closed fast block and bleed valve which may be manually operated or be programmed to automatically reset or to require manual rest and provide a means to manually override the safety system.  Applications of pilot pressure allows supply pressure to pass from inlet port to outlet port. When the the pilot pressure is removed, the relay shuts off the supply pressure and back bleeds quickly.

crbbmAPPLICATION:  The figure to the right illustrates a typical application for the relay.  In this application, the relay is utilized to separate the higher control pressure from the lower pressure instrument supply and to provide a means of fast bleeding the SSV Safety valve actuator pressure which is not possible through the smaller orifices of the PSHL sensor.  It provides the means to manually override the PSHL sensor to hut in and lock out the system once the SSV safety valve is closed.

crbbm relay open

 

For a Quick Quote on the AXELSON CRBBM RELAY

SEND AN EMAIL BELOW OR CALL SUE AT 877-244-4883: 

crbbm relay

Natural Gas for Our Future
Natural Gas an ideal fuel source for many reasons, including safety. Natural Gas is lighter than air. This means that it will not puddle (like gasoline) or sink to the ground like propane, which is heavier than air. Instead, Natural Gas will rise and dissipate in the atmosphere. Natural gas also has a higher ignition temperature. This means that it is much harder to ignite. Also the storage systems used for compressed natural gas are infinitely stronger that the gasoline tanks found on cars and trucks today.
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CONTACT US

Toll Free: 1-877-244-4883
Fax: 412-257-8890
Phone: 412-257-8866

SHIPPING ADDRESS
P.C. McKenzie Company
1365 McLaughlin Run Road
Pittsburgh, PA 15241

MAILING ADDRESS
P.C. McKenzie Company
P.O. Box 112638
Pittsburgh, PA 15241

- P.C. McKenzie Company is located South of Pittsburgh, Pennsylvania -


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