Cla-Val CRL-60 Series - Manual

CRL-60
Pressure Relief Control
• 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-60 Pressure Relief Valve is a direct-acting,
spring loaded, diaphragm type relief valve. Often used as a pilot control
for Cla-Val Hytrol valves, it can also be used as a standalone pressure
relief valve. The CRL-60 may be installed in any position. It opens and
closes within very close pressure limits. The bottom plug may be
removed and installed in the inlet to convert it to an angle pattern flow
path.
The Model CRL-60 is 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 a sensing port
on the CRL body.
Pressure adjustment is simply a matter of turning the adjusting screw to
vary the spring pressure on the diaphragm. The CRL-60 is available in
four pressure ranges: 0 to 75 psi, 20 to 105 psi, 20 to 200 psi, and 100 to
300 psi. To prevent tampering, the adjustment cap can be wire sealed by
using the lock wire holes provided in the cap and cover; or supplied with
a X140-1 Locking Cap. The X140-1 is a key and six-pin cylinder locking
security cap that completely encapsulates the pilot control adjustment
screw and cannot be removed without the appropriate key.
Available in a wide range of
materials including seawater
service nickel aluminum
bronze and stainless steel.
Certified to meet low lead
requirements.
SERIES
Typical Application for CRL-60 Pressure Relief Control
CRL-60 Pressure
Relief Control
50 Series Pressure Relief Control Valve
Model CRL-60 Pressure Relief Control is ideally suited as pilot
control for Cla-Val Series 50 pressure relief or pressure sustaining
automatic control valves. The 50 Series valves are hydraulically
operated, pilot controlled, modulating type valves, used where
pressure relief is needed in a waterworks pipeline distribution
system downstream of any high pressure source, such as pressure
reducing stations or pump stations, or they can also be used in a
bypass to control pump delivery pressure.
Model CRL-60 is designed to maintain constant upstream pressure
to close limits at a remote point in many Cla-Val pilot control
systems. Cla-Val 50 Series Pressure Relief Valves use CRL-60 to
sense and actuate main valve using inlet line pressure through
pilot system. In event of a pressure surge in pipeline, CRL-60
remotely sensing valve inlet pressure opens quickly to control main
valve opening and maintains water flow to atmosphere to dissipate
pressure surge. CRL-60 closes slowly as the inlet pressure lowers
to a safe pressure to prevent new surges, and finally when inlet
pressure is below the pressure setting, the main valve closes drip
tight. Pressure setting adjustment is made with a single adjusting
screw that has a protective cap to discourage tampering.