Cla-Val CRL & 55F - Manual (Page 2)

CRL & 55F
Pressure Relief Valves
Dimensions (In Inches)
55F Model
• Direct Acting - Precise Pressure Control
• Positive Dependable Opening
• Drip Tight Closure
• No Packing Glands or Stuffing Boxes
• Sensitive to Small Pressure Variations
The Cla-Val Model CRL and 55F Pressure Relief Valves are direct-acting,
spring loaded, diaphragm type relief valves. Often used as pilot controls
for Cla-Val Hytrol valves, they can also be used as self-contained
pressure relief valves. These valves may be installed in any position and
open and close within very close pressure limits.
The Model CRL and 55F are normally held closed by the force of the
compression spring above the diaphragm. Control pressure is applied
under the diaphragm. When the controlling pressure exceeds the spring
setting, the disc is lifted off its seat, permitting flow through the control.
When control pressure drops below the spring setting, the spring forces
the control back to its normally closed position. The controlling pressure is
applied to the chamber beneath the diaphragm through an external tube
on the Model 55F and a sensing port on the CRL.
Pressure adjustment is simply a matter of turning the adjusting screw to
vary the spring pressure on the diaphragm. To prevent tampering, the
adjustment cap can be wire sealed by using the lock wire holes provided
in the cap and cover.
1.75
1.75
Pressure
Setting
Adjustment
Screw
(Turn Clockwise
To Increase Setting)
7.44
.71
INLET
1.75
3.50
4.50
Note: Also Available in Seawater Service Material
MODELS