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Poppet Block Control
Oil ow capacities for the Shafer Poppet Control are:
Flow @ Flow @
1000 PSI 2000 PSISize (50 F.P.S.) (70 F.P.S.) Test/Rate
1/4" 17 G.P.M. 24 G.P.M. 4500/3000 PSI1/2" 35 G.P.M. - - -
2160/1440 PSI(Abbreviations used : F.P.S. - Feet Per Second, G.P.M-
Gallons Per Minute, PSI - Pounds Per Square Inch)
Special Shafer Poppet Controls are available withhigh
pressure/high ow characteristics as follows:
Flow @ Flow @ 1000 PSI 2000 PSI
Size (50 F.P.S.) (70 F.P.S) Test/Rate1/2" 47 G.P.M. 65 G.P.M.
4500/3000 PSI
3/4" 82 G.P.M. 115 G.P.M. 3375/2250 PSI1" 134 G.P.M. 189 G.P.M.
3375/2250 PSI1-1/4" 230 G.P.M. - - - 2160/1440 PSI1-1/2" 315 G.P.M.
- - - 2160/1440 PSI
Shafer
The poppet block is the heart of most Shafer ValveOperating
Systems. This double three-way control valveis designed to provide
selective directional operation o
Shafer valve actuators. The poppet block control maydirect power
gas to a set of gas hydraulic tanks generatinghydraulic pressure
for powering the actuator, or it maydirect central hydraulic system
pressure directly intothe actuator. The poppet control is designed
to handleworking pressures to 3000 psi. Manual operation may
beprovided with a removable and lockable handle.
In automatic or remote control versions, the control isactuated
by pressurizing a piston located directly undethe poppets. This is
done by using a variety of valvingas described in the following
pages.
The poppet block is designed to provide reliable and
durable operation. It contains two sets of inexpensiveeasily
replaced nylon poppets which provide tight sealingwhile retaining a
considerable toleration of contaminantswhich may nd their way into
the power source.
Power gas or oil is ltered through a 140 micron strainebuilt
into the control. On controls where pilot gas fovalving is
required, the gas is further ltered through a25 micron
strainer.
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www.EmersonProcess.com/Shafer
Shafer2500 Park Ave. WestMansfeld, OH 44906Phone (419)
529-4311FAX (419) [email protected]
Shafer
Bulletin PB-310-0042005
POPPET BLOCK CONTROL
OPEN
MANUALHYDRAULICHAND PUMP
EXHAUSTGAS
POWERGAS
MANUALOPERATION
ROTARY VANEACTUATOR
ADJUSTABLE SPEEDCONTROLS (OPTIONAL)
CLOSE
CLOSE K
J I
A
DF
E
B C
H
L
OPEN
MANUAL HYDRAULICHAND PUMP
EXHAUSTGAS
POWERGAS
MANUALOPERATION
ROTARY VANEACTUATOR
ADJUSTABLE SPEEDCONTROLS (OPTIONAL)
CLOSE
CLOSE K
J I
A
DF
E
B C
H
L
The Shafer Manual Poppet Block Control isdesigned for local
operation of Shafer valveactuators using power gas or oil to stroke
theactuator. The basic operation is as follows.
SEQUENCE 1 - VALVE OPENThe valve actuator is shown in open
position.Power gas connected to the poppet block (A),ows past power
storage tank check valve (C),through the 140 micron power gas
strainer (B)and lls the optional power storage tank (J).Power gas
also ows into the back side of thepoppet block (A) forcing the
power poppets(H) and (I) onto their seats. Simultaneously,the
interconnecting poppet pins force theexhaust poppets (E) and (F)
off their seats.The cylinder ports are open to exhaust,venting any
tank or actuator pressure throughthe exhaust check valve.
SEQUENCE 2 - VALVE CLOSINGBy pulling on the control handle
markedclose, the push pin contacts the pilot piston(D) and forces
the exhaust poppet (F) onto itsseat. Simultaneously, via the
interconnectingpoppet pin, the power poppet (H) is forcedoff its
seat allowing power gas to pressurizethe closing gas hydraulic tank
(K), forcing thepressurized uid into the actuator and causingthe
actuator to close. The uid displacedfrom the actuator ows into the
opening gashydraulic tank (L) which is open to atmospherethrough
the exhaust check valve in the poppetblock (A).
SEQUENCE 3 - VALVE FULLY CLOSEDWhen the valve reaches the closed
positionand the manual control handle is released,the force of the
power gas and springcompression reseats power poppet (H) andunseats
exhaust poppet (F) allowing gashydraulic tank pressure to vent to
atmospherethrough the exhaust check valve. To re-openthe valve, the
control handle marked open ispulled and poppets (I) and (E) are
actuated,which pressurizes the opening tank (L) andcauses the
operator to open.
Pressurized Hydraulic Fluid
High Pressure GasNon-Pressurized Hydraulic Fluid
Exhaust Gas
OPEN
MANUAL HYDRAULICHAND PUMP
EXHAUSTGAS
POWERGAS
MANUALOPERATION
ROTARYVANEACTUATOR
ADJUSTABLE SPEEDCONTROLS (OPTIONAL)
CLOSE
OPEN K
J I
A
DF
E
B C
H
L
