Installation, Operation and Maintenance Manual
PBC-01102001 Rev. A
January 2001
7
Section 2: Basic Check Out Procedures
Basic Check Out Procedures
Section: 2 Basic Check Out Procedures
The following two checks illustrate proper working functions of the Shafer Poppet Block.
Failure of any of these procedures may result in operating problems with the valve actuator.
This description is for gas service, but the unit can also be used in hydraulic service.
Figure 6
POWER
PILOT
EXHAUST OR
RETURN OIL
2.1
Check No.1
There should be zero leakage throughout the control system.
In the neutralized position there should be zero power gas leakage from the exhaust port.
Power gas leakage is usually attributed to debris lodged between the power poppet and seat.
2.2
Check No. 2
Pull the manual lever to full travel and stroke the actuator partially open or closed.
NOTE:
The manual lever for open and close is indicated on the attached tag.
After stroking the actuator partially open or closed, release the manual lever thus
exhausting the gas/hydraulic tank.
After the gas/hydraulic tank is completely exhausted, check the exhaust port for any gas
leakage.
The exhaust port should be free of any restrictions or piping size reductions less than 1/2
NPTF unless factory supplied.
