Cla-Val 55L-60 - Manual

Fire Protection System Service
The
Model 55L-60 is typically used in a
fire protection system to trim water
pressure, thus preventing pressure build-
up whenever line pressure exceeds the
setting of the spring.
The 55L-60 will relieve excess pressure to
atmosphere to prevent damage to the
distribution network.
NOTE: Model 55L-60 is not suitable for
discharging the full-rated pump capacity of
a fire pump. See Model 50B-4KG1 Fire
Pump Relief Valve for such applications.
Typical Application for Fresh Water or Seawater Service
Pressure Relief Valve/
Pump Casing Relief Valve
55L-60
• UL Listed
• Factory Mutual Approved
• UL Listed/FM Approved for use as a fire pump casing
relief valve
• 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 55L-60 (UL Listed, FM approved) Pressure Relief Valve
is a direct-acting, spring loaded, diaphragm type relief valve. The valve may
be installed in any position and will open and close 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 55L-60 is normally held closed by the force of the compression
spring above the diaphragm. When the controlling pressure applied under the
diaphragm 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 internal passage. A gauge port is provided for accurate pressure
setting.
Pressure adjustment is done by turning the adjusting screw to vary the spring
load on the diaphragm. The 55L-60 is available in pressure ranges suited to
agency approval tests. To prevent tampering, the adjustment cap can be wire
sealed by using the lock wire holes provided in the cap and cover.
Available in a wide range of materials including
nickel aluminum bronze and stainless steel.
Certified to meet low lead requirements
MODEL
Fire Pump Casing
Relief Valve