Page 712 - CarrLaneCatalog_2019ed-c.pdf

Pilot-Operated Check Valves 7250 psi max

• Holds clamping pressure until released OPERATION: The flow from B ȻA is free.
by a separate pilot pressure line The flow from A ȻB is locked, but can be
• Allows only one-way flow until released hydraulically unlocked by pressurizing control
port Z.
• Excellent safety device if fluid line to
CONTROL PRESSURE: To unlock the check
fixture may become damaged
valve for return flow, control (pilot) pressure
• May be used to prevent workpieces from must be greater than (0.32 x Pressure ) + 175
A
floating between opposing clamps psi for the smaller valve and (0.38 x Pressure )
A
• Spring-loaded ball-seat valve + 175 psi for the larger size.
(leakage free) MOUNTING: In-line mounting with tubing
connectors. Control port Z is 1/4 BSPP. Ports
Z A & B are 1/4 BSPP on the smaller size, 1/2
B A BSPP on the larger size. To reduce 1/2 BSPP
to 1/4 BSPP, order adaptor CLR-3613-015-F.
Symbol DESIGN CONSIDERATIONS: This pilot-
operated check valve is not suitable for locking
of double-acting swing clamps (pull-type
In-Line Mounted cylinders). Due to the unfavorable surface ratio
of these elements, the control pressure is not
sufficient for unlocking and dangerous pressure
intensification can occur.

Example 1:
Workpieces remain clamped
even if fluid line be tween
power source and fixture
becomes damaged.

Example 2:
Two opposing clamps
(on right side) allow the
workpiece to float between
them to avoid distorting it.
Without check valves, the
workpiece would remain
unstable since either clamp
could retract or extend
further by shifting fluid to
the other. Check valves
lock the clamps in their
settled position by allowing
only one-way flow.

Max. flow rate (cu. in./min.) 920 3360
Max. operating pressure (psi) 7250 7250
Ø.79 Control fluid volume (cu. in.) .01 .02
b
Port size, A & B 1/4 BSPP 1/2 BSPP
Port Size, Z 1/4 BSPP 1/4 BSPP
z SW
c a 3.31 3.94
b 1.24 1.44
c 1.06 1.22
B
14 A
SW 24mm 32mm
Weight (lbs) .9 1.3
Part No. CLR-2951-417-V CLR-2951-501-V
a
Carr Lane Roemheld Mfg. Co.
Sales — Phone (314) 647-6200 Fax (314) 647-5736
Engineering — Phone 1-800-827-2526 Web roemheld-usa.com
710 8/18