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8-PORT
VALVE ROD GUIDE
AUTOMATIC
LATCH ON/OFF TOOL
BALLS
AND SEATS
BARRELS
BOTTOM
DISCHARGE VALVE
COM-PAC
STUFFING BOX
DUAL
PAC STUFFING BOX
HOLD-DOWNS
HYDRAULIC
TUBING DRAIN
INSERT
CAGE
NON-ALIGNING
UNION, OR SWIVEL
PICKUP
SUB
POLISHED
ROD LINER ASSEMBLIES
POLLUTION
CONTROL CHECK VALVE AND STUFFING BOX
PRESSURE
CONTROL REGULATOR
ROD
PUMP PLUNGERS
SPIRAL
GUIDE
SPOOL CHECK VALVE
SUCKER
ROD COUPLINGS
VALVE
ROD GUIDE
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SPOOL CHECK VALVE
The Spool Check Valve was designed to assist the travelling
valve in opening during the down stroke on gaseous wells.
The gaseous fluid in the pump chamber tends to delay the opening
of the travelling valve because of its compressibility. The
pressure above the plunger is greater than the pressure below
the plunger. With standard pumps much of the down stroke is
used to compress the mixture in the pump chamber. The spool
check valve removes the pressure off the plunger valve therefore
allowing it to open sooner and increasing the pump efficiency.
The spool check valve is available for stationary barrel
bottom hold down pumps in brass or hardened stainless steel.
The spool check valve also works as an excellent sand check
valve.

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