Cla-Val 55L-60 User Manual

MODEL

55L-60

Pressure Relief Valve/

Pump Casing Relief Valve

• 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.

Available in a wide range of materials including

nickel aluminum bronze and stainless steel.

Certified to meet low lead requirements

Fire Protection System Service

The

Model 55L-60 is typically used in a

fire protection system to trim water
pressure, thus preventing pressure build­up whenever line pressure exceeds the
setting of the spring.

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.

Typical Application for Fresh Water or Seawater Service

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.

Fire Pump Casing

Relief Valve

9.24

1.31

2.00

2.00

6.75

1.31

CLA-VAL EUROPE

Chemin des Mésanges 1
CH-1032 Romanel/
Lausanne, Switzerland
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

CLA-VAL FRANCE

Porte du Grand Lyon 1
ZAC du Champ du Périer
France - 01700 Neyron
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

CLA-VAL

PO Box 1325 Newport Beach CA 92659-0325

800-942-6326 Fax: [phone] Web Site: cla-val.com E-mail: [e-mail]

COPYRIGHT CLA-VAL 2014 Printed in USA Specifications subject to change without notice.

CLA-VAL CANADA

4687 Christie Drive
Beamsville, Ontario
Canada L0R 1B4
Phone: [phone]
Fax: [phone]
E-mail [e-mail]

CLA-VAL UK

Dainton House, Goods Station Road
Tunbridge Wells
Kent TN1 2 DH England
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

CLA-VAL PACIFIC

45 Kennaway Road
Woolston, Christchurch, 8023
New Zealand
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

Specifications

Size 1/2" & 3/4" Threaded NPT
Temperature Range Water, Air: to 180°F Max.
Materials

Body & Cover: Cast Bronze UNS C87850

Stainless Steel ASTM A743-CF-16Fa

Trim: 303 Stainless Steel

Rubber: Buna-N

Pressure Ratings Cast Bronze 400 psi Max.

Other Materials Available on special order

Adjustment Ranges

UL Listed & 0 to 75 psi
FM Approved 20 to 200 psi

®

Synthetic Rubber

Stainless Steel 400 psi Max.

100 to 300 psi

Dimensions: 0 to 75 and 20 to 200 psi design

1/8” NPT
Pressure

Gauge Port

INLET

3.50

UL Listed/FM Approved

55L-60 Range psi

Approximate Increase

for Each Clockwise Turn

0 to 75

20 to 200 28.0 psi

100 to 300 18.0 psi

Pressure Drop Chart (Full Open Valve)

Valve

Size

1/2"

3/4"

C

Factor

8.5 0.3 1.4 3.1 5.5 12.2

Flow of Water - Gallons Per Minute

v

5 10 16 20 30

6 0.7 2.7 6 11 --

When Ordering, Please Specify

1. Catalog No. 55L-60

2. Valve Size

3. Adjustment Range Desired

4. Optional Materials

of Adjusting Screw

8.5 psi

(applies to both

AA

configurations)

Dimensions: 100 to 300 psi design

1/8” NPT
Pressure

Gauge Port

3.12

E-55L-60 (R-05/2014)