Specifications Seawater Service Option
Sizes
Globe: 2" - 10" flanged
Angle: 2" - 10" flanged
Consult factory for materials and flange ratings.
Valve Size
(mm)
50
100
150
200
G & H
152
200
216
Screwed Ends
238
--
--
--
248
A 150 Flanged
238
381
508
645
300 Flanged
254
397
533
670
300 x 150
--
389
522
670
C
305
330
363
414
D
38
81
109
135
Screwed Ends
121
--
--
--
E 150 Flanged
121
191
254
324
300 Flanged
127
200
267
337
Screwed Ends
83
--
--
--
F 150 Flanged
83
127
152
203
300 Flanged
89
135
165
216
250
--
337
756
806
773
457
235
--
378
395
--
219
236
300
--
362
864
902
883
522
273
--
432
451
--
349
368
302
B
86
148
203
257
357
80
197
318
305
337
327
318
158
117
159
152
162
114
102
111
65
170
279
279
295
--
311
43
103
140
140
423
102
102
109
Model 2050B-4KG-1 Angle
Model 50B-4KG-1 Globe
We recommend providing adequate space around valve for maintenance work.
Specifications
Globe: 2" - 12" flanged
Angle: 2" - 12" flanged
150 and 300 ANSI B16.42
class - 175 psi Max.
class - 300 psi Max
Water, to 180°F Max.
Main Valve Body & Cover
Ductile Iron ASTM A-536
Naval Bronze ASTM B61
Other Material Available
Standard Main Valve Trim:
Bronze Seat, Teflon Coated
Stainless Steel Stem, Delrin Sleeved
Standard Pilot Control System:
Cast Bronze with
Stainless Steel trim
Available in the following relief
pressure ranges:
20-200 psi (150 Class)
100-300 psi (300 Class)
Protective epoxy resin coating
of wetted surfaces of main
valve cast iron components
(UL listed HNFX EX2855)
Dimensions
B
G
H
E
C
F
A
C
D
The Fire Pump Pressure Relief Valve shall modulate to relieve excess
pressure in a fire protection system. It shall maintain constant pressure
in the system regardless of demand changes. It shall be pilot controlled
and back pressure shall not affect its set point. It shall be actuated by
line pressure through a pilot control system and open fast in order to
maintain steady system pressure as system demand decreases. It shall
close gradually to control surges and shall re-seat drip-tight within 5% of
its pressure setting. The main valve shall be of the hydraulically-operat-
ed, pilot-controlled, diaphragm-type, globe or angle valve. It shall have
a single, removable, teflon-coated seat, a delrin-sleeved stem guided at
both ends, and a resilient disc with a rectangular cross section, being
contained on 3 1/2 sides. No external packing glands shall be permitted
and the diaphragm shall not be used as a seating surface. The pilot con-
trol shall be a direct-acting, adjustable, spring-loaded, diaphragm-type
valve designed for modulating service to permit flow when controlling
pressure exceeds spring setting. This valve shall be UL Listed and
Factory Mutual approved. It shall be the MODEL 50B-4KG-1 (globe) or
Model 2050B-4KG-1 (angle) Pressure Relief Valve as manufactured by
Cla-Val Newport Beach, California.
*Special Note:
The Model 50B-4KG-1 Pressure Relief Valve is available with 300# ANSI
inlet flange and 100# ANSI outlet flange. This valve is used on higher
pressure systems where 300# flange connections are required, and
allows for adapting of a discharge cone (generally supplied with 150#
flange) to accommodate "atmospheric break" at relief valve discharge.
This relief valve, with 300# X 150# flanges is available on special order,
and is UNDERWRITERS LABORATORIES LISTED AND FACTORY
MUTUAL APPROVED.
Purchase Specifications
Valve Sizes in Inches:
2"
2
3"
4"
6"
NFPA 20 Maximum
Recommended GPM 208
300
500 1000 2500
8"
5000
Valve Capacity
Valve Size
(inches)
2"
4"
6"
8"
G & H
6.00
7.88
8.50
Screwed Ends
9.38
--
--
--
9.75
A 150 Flanged
9.38
15.00
20.00
25.38
300 Flanged
10.00
15.62
21.00
26.38
300 x 150
15.31
20.56
26.38
C
12.00
13.00
14.31
16.31
D
1.50
3.19
4.31
5.31
Screwed Ends
4.75
--
--
--
E 150 Flanged
4.75
7.50
10.00
12.75
300 Flanged
5.00
7.88
10.50
13.25
Screwed Ends
3.25
--
--
--
F 150 Flanged
3.25
5.00
6.00
8.00
300 Flanged
3.50
5.31
6.50
8.50
10"
--
13.25
29.75
31.72
30.44
18.00
9.25
--
14.88
15.56
--
8.62
9.31
12"
--
14.25
34.00
35.50
34.75
20.56
10.75
--
17.00
17.75
--
13.75
14.50
11.87
B
3.37
5.81
8.00
10.12
14.06
10"
11000
12"
16000
3"
7.75
12.50
12.00
13.25
12.88
12.50
2.19
4.62
6.25
6.00
6.38
4.50
4.00
4.38
Sizes
End Details
Pressure Ratings
Materials
Adjustment Range
Optional
2 1/2"
6.69
11.00
11.00
11.62
12.25
1.69
4.06
5.50
5.50
5.88
4.00
4.00
4.31
CLA-VAL
PO Box 1325 Newport Beach CA 92659-0325
Phone: 949-722-4800
•
Fax: 949-548-5441
CLA-VAL CANADA, LTD.
CLA-VAL SA
4687 Christie Drive
Beamsville, Ontario
Canada LOR 1B4
Phone: 905-563-4963
Fax: 905-563-4040
Chemin des Mesanges 1
CH-1032 Romanel/
Lausanne, Switzerland
Phone: 41-21-643-15-55
Fax: 41-21-643-15-50
©
COPYRIGHT CLA-VAL 2000 Printed in USA
Specifications subject to change without notice.
www.cla-val.com
E-50B-4KG-1 (R-6/00)
Represented By: