Graham Corporation
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Section 4 - Accessory Items
4.1 Accessories
There are many accessory items associated with Liquid Ring Vacuum Pumps and Compressors.
They can be supplied by Graham and shipped from the factory or can be supplied by others and
installed in the field. The particular requirements, mode of operation, and type of control
scheme desired dictate the necessity of various items. The following is a list of common
accessories.
Inlet Check Valve Used to prevent a back flow of gas into the process when the
pump is stopped. Check valves are normally installed in a
horizontal line. An elbow can be provided to adapt the vertical
pump inlet to accept a horizontal check valve.
Vacuum Relief Valve Used to protect the pump from cavitation and control the pump
suction pressure. When the pump capacity exceeds the system’s
flow requirements at a pre-determined level, the valve will
open and bleed in atmospheric air or process gas.
Flexible Connector Used to compensate for minor misalignment or expansion
between the pump connections and the process piping.
Vacuum Gauge Used to indicate vacuum at the pump inlet. Normally mounted
directly ahead of the pump suction.
Shut-off Valve Used to manually stop the flow of service liquid to the pump.
Strainer Used to filter out solid particles that will damage the pump.
Flow Regulator Used to control the service liquid flow rate to the pump.
A manual valve, a fixed orifice, or a flexible element orifice
may be used depending on the application.
Compound Gauge Used to indicate pressure in the service liquid piping.
Discharge Separator Used to separate the service liquid from the discharged gas as it
comes out of the pump. The liquid can be piped to a drain or
recovered for reuse.
Solenoid Valve Used to automatically stop or start the flow of service liquid to
the pump. Normally interlocked to the pump motor.
By-pass Valve Used to initially fill the pump with service liquid or for bypass
in case the solenoid coil fails.
Recirculation Pump Used to circulate the service liquid recovered from the
discharge separator in some total recovery systems.
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