Cla-Val 55B-60 User Manual

MODEL

90 Series

Pressure

Reducing Valves

55B-60

Pressure 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 55B-60 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 55B-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.

Available in a wide range of

materials including

nickel aluminum bronze and

stainless steel. Certified to

meet low lead requirements.

The Model 55B-60 is used in high­rise building water systems to prevent
pressure build-up whenever line
pressure exceeds the setting of the
spring.

Typically installed downstream of
pressure reducing valves, the 55B-60
relieves excess pressure to
atmosphere to prevent damage to the
distribution network Adequate
drainage must be provided.

visit www.cla-val.com

to learn more

Pressure adjustment is simply a matter of turning the adjusting screw to
vary the spring load on the diaphragm. The 55B-60 is available in three
pressure ranges; 0 to 75 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.

Typical Application

55B-60 Pressure

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 - Low Lead

Stainless Steel ASTM A743-CF-16Fa

Trim: 303 Stainless Steel

Rubber: Buna-N

®

Synthetic Rubber

Pressure Ratings Cast Bronze 400 psi Max.

Stainless Steel 400 psi Max.

Other Materials Available on special order

Adjustment Ranges

Dimensions: 0 to 75 and 20 to 200 psi design

1/8” NPT
Pressure

Gauge Port

INLET

55B-60 Range

psi

0 to 75

Approximate Increase

for Each Clockwise Turn

of Adjusting Screw

8.5 psi

20 to 200 28.0 psi

100 to 300 18.0 psi

Flow Loss Chart (Full Open Valve)

Flow of Water - Gallons Per Minute

Valve

Size

1/2"

3/4"

C

v

Factor

5 10 16 20 30

6 0.7 2.7 6 11 --

8.5 0.3 1.4 3.1 5.5 12.2

When Ordering, Please Specify

1. Catalog No. 55B-60

2. Valve Size

3. Adjustment Range Desired

4. Optional Materials

3.50

(applies to both

AA

configurations)

Dimensions: 100 to 300 psi design

1/8” NPT
Pressure

Gauge Port

3.12

E-55B-60 05/2014