Founded in 1874, Crosby’s earned worldwide recognition in overpressure protection.
Crosby supplied the nuclear pressure relief valves for the first atomic submarine (USS Nautilus) and the first commercial nuclear
power plant at Shippingport, Pennsylvania. The dedication and commitment that has existed for over 125 years is still present
today as we continue to meet the high demands of today's nuclear industry.
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HA (Safety Valve)
The Crosby Style HA has been designed for the exacting service and operating requirements of nuclear power plants. Style HA assures
precise operation and continuing tightness plus ease of maintenance which characterizes Crosby safety valves. It is intended for
service on pressurized water reactors as the main steam safety valve.
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Inlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification:
Optional Features:
| 6" and 8" (152.4 mm and 203.2 mm)
Flanged, Studded, Welded
Q through T
Up to 1400 psig (96.6 barg)
Forged Carbon Steel/Stainless Steel Nozzle/Inconel* Disc Insert
Adjustable Blowdown Control
Saturated Steam
Section III
FLEXI-DISC Seat Design Dual
Outlet Design
*Inconel is a registered trademark
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HB-BP (Safety Valve)
The Crosby Style HB-BP is designed specifically to meet the exacting requirements of nuclear power plant applications where the
valve is not allowed to discharge to the atmosphere. The bellows "balances out" the effects of high backpressure in
the discharge system, assuring constant popping pressure despite variable backpressure, Crosby's patented eductor design controls
the dynamic forces of discharging fluid to stabilize valve performance. The valve provides full capacity, stable operation at
backpressure up to 50% of the set pressure. The valve is used as a Pressurizer Safety valve in pressurized water reactors throughout
the world.
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Inlet Sizes:
Connection:
Orifice Size:
Set Pressure Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification:
Optional Features:
| 3" through 6" (76.2 mm through 15.4 mm)
Flanged or Studded
K through N
Up to 2500 psig (172.4 bar)
Stainless Steel Body, Nozzle and Inconel Disc Insert
Adjustable Blowdown Control
Saturated Steam
Section III
FLEXI-DISC® Seat Design, Block Body Design for Applications with High Discharge Loads
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HB-BP-DF (Safety Relief Valve)
The Crosby HB dual function safety relief valve fulfills the special overpressure safety requirements of boiling water reactor
primary loops (where remotely controlled automatic steam blowdown valves are not used). The valve will pop automatically at the
set pressure or may be opened by means of an electrical signal to one, two or three solenoid valves that actuate the air cylinder
on the main steam valve. Mounted to the primary steam generator piping, the style HB dual function valve has similar construction
and performance features to the HB pressurizer valve.
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Inlet Sizes:
Connection:
Orifice Size:
Set Pressure Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification: |
6" through 8" (152.4 mm through 203.2 mm)
Flanged or Studded
R
Up to 1400 psig (96.6 barg)
Forged Carbon Steel, Stainless Steel Nozzle and Inconel Disc Insert
Adjustable Blowdown Control
Saturated Steam
Section III |
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JBS
The Crosby Style JBS is a balanced pressure relief valve designed for use on steam, air and gas service. The balancing bellows
minimizes the effects of backpressure and prevents the process fluid from entering the spring chamber. The valve is designed with
a single ring control (nozzle ring) to assure optimum performance. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification:
Options:
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1" through 8" (25.4 mm through 203.2 mm)
2" through 10" (50.8 mm through 254 mm)
Flanged
D through T2
15 psig to 6000 psig (1.03 barg to 413.8 barg)
-450°F to +1000°F (-267.8°C to +537.8°C)
Cast Carbon Steel or Stainless Steel with Stainless Steel Trim is Standard
Alternate Materials Available
Adjustable Blowdown Control
Steam, Air and Gas
Section III & VIII
Soft Seat Design |
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JOS
The Crosby Style JOS is a conventional pressure relief valve designed for use on steam, air and gas service. The valve is designed
with a single nozzle ring control to assure optimum performance.
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification:
Options:
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1" through 8" (25.4 mm through 203.2 mm)
2" through 10" (50.8 mm through 254 mm)
Flanged
D through T2
15 psig to 6000 psig (1.03 barg to 413.8 barg)
-450°F to +1000°F (-267.8°C to +537.8°C)
Cast Carbon Steel or Stainless Steel with Stainless Steel Trim is Standard
Alternate Materials Available
Adjustable Blowdown Control
Steam, Air and Gas
Section III & VIII
Soft Seat Design
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JLT-JOS/JBS
The Crosby styles JLT-JOS is a conventional pressure relief valve designed for liquid service. The JLT-JBS is a balance pressure
relief valve for liquid service. The balancing bellows minimizes the effects of backpressure and prevents the process fluid from
entering the spring chamber. The internal trim of both the JLT-JOS and the JLT-JBS provides stable non-chattering valve performance
on incompressible fluid applications. this superior high performance valve has increased capacity at 10% overpressure that often
permits the use of a smaller valve for the application.
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Sizes:
Orifices:
Temperature Range:
Set Pressure Range:
JOS and JLT-JOS:
JBS and JLT-JBS:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification:
Options: |
1" through 8" (25.4 mm through 203.2 mm)
2" through 10" (50.8 mm through 254 mm)
D to T2
-450F to +1000F (-268C to +538C)
15 to 6000 psig (1.03 to 413.79 barg)
25 to 6000 psig (1.72 to 413.79 barg)
Cast Carbon Steel or Stainless Steel with Stainless Steel Trim is Standard
Alternate Materials Available
Adjustable Blowdown Control
Liquid
Section III & VIII
Soft Seat Design
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JO
The Crosby Style JO is a conventional safety relief valve that provides two ring control for positive adjustment of both blowdown
and pop action. The JO is designed for use on steam, air and gas service. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification:
Options:
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1" through 8" (25.4 mm through 203.2 mm)
2" through 10" (50.8 mm through 254 mm)
Flanged
D through T
15 psig to 7500 psig (1.03 barg to 517.2 barg)
-400°F to +1000°F (-240°C to +537.8°C)
Cast Carbon Steel or Stainless Steel with Stainless Steel Trim is Standard
Alternate Materials Available
Adjustable Blowdown Control
Steam, Air and Gas
Section III & VIII
Soft Seat Design |
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JB
The Crosby Style JB is a balanced pressure relief valve that provides single ring control for positive adjustment of blowdown.
The balancing bellows minimizes the effects of backpressure and prevents the process fluid from entering the spring chamber.
The JB is designed for use on steam, air and gas service.
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification:
Options: |
1" through 8" (25.4 mm through 203.2 mm)
2" through 10" (50.8 mm through 254 mm)
Flanged
D through T
15 psig to 7500 psig (1.03 barg to 517.2 barg)
-400°F to +1000°F (-240°C to +537.8°C)
Cast Carbon Steel or Stainless Steel with Stainless Steel Trim is Standard
Alternate Materials Available
Adjustable Blowdown Control
Steam, Air and Gas
Section III & VIII
Soft Seat Design
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JO and JB “Over-T”
The JO and JB valve designs are also offered with orifice sizes greater than “T” for applications with high flow
requirements. The largest, with a capacity nearly seven times that of a “T” orifice valve, can relieve over 3,000,000
lb/hr (1,360,800 kg/hr) steam at 300 psi (20.7 bar) pressure. Their dependability and performance has been proven by successful
operation in nuclear power stations worldwide. A typical application in the nuclear power station is the moisture separator/reheater.
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Inlet Sizes:
Outlet Sizes:
Orifice Sizes:
Set Pressure Range:
Temperature Range:
Materials:
Service Media:
ASME Code Capacity Certification: |
10” through 20” (254 mm through 508 mm)
14” through 24” (355.6 mm through 609.6 mm)
V (47.85 sq. in.) through BB2 (213.82 sq. in.)
(30871 sq. mm. through 137948 sq. mm.)
25 psig to 300 psig (1.7 barg to 20.7 barg)
-25ºF to 450ºF (-36.67ºC to 232.2ºC)
Cast Carbon Steel with Stainless Steel trim is standard
Alternate Materials Available.
Steam, Air and Gas
Section III & VIII |
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JMB-WR
The Crosby Style JMB-WR is a conventional pressure relief valve designed for liquid service. Its water ring design provides stable
non-chattering valve performance on incompressible fluid applications with adjustable blowdown control. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification: |
3/4" and 1" (19.1 mm and 25.4 mm)
1" (25.4 mm)
Flanged, Threaded, and Welded
0.0120 through 0.1098 sq. in.
(7.7 sq. mm through 70.8 sq. mm)
15 psig through 2750 psig
(1.03 barg through 189.7 barg)
-75°F to +750°F (-59.4°C to +398.9°C)
Stainless Steel
Alternate Materials Available
Adjustable Blowdown Control
Liquid
Section III & VIII
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JMAK
Crosby JMAK is a conventional relief valve designed for use on liquid service. Its small orifice design makes it ideal for low
flow applications at high or low pressures. The water ring allows for adjustable blowdown control. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification: |
½", ¾", 1" (12.7 mm, 19.1 mm, 25.4 mm)
1" (25.4 mm) and larger
Flanged or Studded
0.012 through 0.1098 sq. in.
(7.7 sq. mm through 70.8 sq. mm)
5 psig through 2750 psig
(0.35 barg through 189.7 barg)
-75°F to +750°F (-59.4°C to +398.9°C)
Stainless Steel
Alternate Materials Available
Adjustable Blowdown Control
Liquid
Section III & VIII
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JRAK-BS
Crosby JRAK-BS is a balanced relief valve designed for use on liquid service. The balancing bellows minimizes the effects of backpressure
and prevents the process fluid from entering the spring chamber. Its small orifice design makes it ideal for low flow applications
at high or low pressures. The water ring allows for adjustable blowdown control. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temp Range:
Materials:
Blowdown:
Service Medium:
ASME Code Capacity Certification: |
½", ¾", 1" (12.7 mm, 19.1 mm, 25.4 mm)
1" (25.4 mm) and larger
Flanged or Studded
0.012 through 0.1098 sq. in.
(7.7 sq. mm through 70.8 sq. mm)
25 psig through 3600 psig
(1.72 barg through 248.3 barg)
-75°F to +750°F (-59.4°C to +398.9°C)
Stainless Steel
Alternate Materials Available
Adjustable Blowdown Control
Liquid
Section III & VIII
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BP Omni-Trim
The Crosby Series BP is a pressure relief valve designed for use on air, gas and liquid service. Its single trim provides stable
operation on multiple service media. The balanced piston design minimizes the effects of backpressure and prevents the process
fluid from entering the spring chamber. An o-ring seat provides for optimum seat tightness and minimal maintenance.
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temperature Range:
Materials:
Blowdown:
Service Media:
ASME Code Capacity Certification: |
¾ and 1” (19.1 mm and 25.4 mm)
1” (25.4 mm)
Flanged, Threaded, and Welded
0.0539 through 0.1364 sq. in.
(34.8 through 88.sq. mm)
15 psig to1500 psig (1.03 barg to 103.44 barg)
-20F to +400F (28.9ºC to 204.4ºC)
Stainless Steel : Alternate Materials Available
Fixed blowdown design guarantees blowdown
less than 25%
Air, Gas, and Liquid
Section III & VIII
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Series 900 Omni-Trim
The Crosby Series 900 OMNI-TRIM is a conventional safety relief valve designed for use on steam, air gas and liquid service. Its
single trim design provides stable operation on all service media. Precision flat metal to metal seats or elastomer. An O-ring
seat provides for optimum seat tightness and minimal maintenance. |
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temperature Range:
Materials:
Service Media:
Blowdown:
ASME Code Capacity Certification:
Options: |
½” through 2” (12.7 through 50.8 mm)
1” through 2 ½” (25.4 through 63.5 mm)
Flanged, Threaded and Welded
0.0551 sq. in. through 0.5674 sq. in.
(35.6 sq. mm through 366.1 sq. mm)
15 psig to 5000 psig
(1.03 barg tp 344.8 barg)
-450ºF to +750ºF (-267.8ºC to +398.9ºC)
Stainless Steel
Alternate Materials Available
Steam, Air, Gas and Liquid
Fixed blowdown design guarantees blowdown less than 20%
Section III & VIII
Soft Seat Design
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Series 800 Omni-Trim
The Crosby Series 800 OMNI-TRIM is a conventional safety relief valve designed for use on steam, air and gas service. Its single
trim design provides stable operation on all service media types. External precise blowdown provides shorter blowdown than the
Series 900.
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Inlet Sizes:
Outlet Sizes:
Connection:
Orifice Sizes:
Set Pressure Range:
Temperature Range:
Materials:
Service Media:
Blowdown:
ASME Code Capacity Certification: |
½” through 2” (12.7 mm through 50.8 mm)
1” through 2 ½” (25.4 mm through 63.5 mm)
Flanged, Threaded and Welded
0.0551 through 0.5674 sq. in.
(35.6 through 366.1 sq. mm)
15 psig to 5000 psig (1.03 barg to 344.8 barg)
-450ºF to +750ºF (-267.8ºC to +398.9ºC)
Stainless Steel, Alternate Materials Available
Steam, Air and Gas
Adjustable Blowdown Control
Section III & VIII
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VR
The Crosby Style VR is a pressure relief valve designed for vacuum relief applications. Vacuum relief valves, provided with metal
or soft seats, protect piping and vessels when operating pressure is suddenly reduced because of system malfunction. |
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Inlet/Outlet Sizes:
Connection:
Set Pressure Range:
Materials:
Service Media:
ASME Code: |
1" through 10" (25.4 mm through 254 mm)
Flanged
-0.1 psig through -7 psig
(-0.007 barg through -0.48 barg)
Stainless Steel
Air and Gas
Section III |
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SPORV (Solenoid Power Operated Relief Valve)
The Crosby Style SPORV is a power operated relief valve designed specifically to meet the exacting requirements of the nuclear
power plants. This unique valve is designed to relieve steam, liquid or steam/liquid mixtures. The SPORV consists of a pressure
actuated main valve controlled by an IEEE qualified solenoid assembly. |
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Inlet Size:
Connection:
Set Pressure Range:
Materials:
Service Medium:
ASME Code: |
3” (76.2 mm)
Flanged or Welded
Up to 2500 psig (172.4 barg)
Stainless Steel Body, Bonnet, Inconel Seat and Plug
Steam, Water or Steam/Water mixture
Section III |
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SPVD - Set Pressure Verification Device
A system for in situ testing, classified as a “calibrated assist device” per ASME Performance Test Code (PTC 25).
Totally automatic - computer driven system for testing safety valves. Available in portable or permanently mounted models.
VPI - Valve Position Indicator
Provides direct, continuous, remote indication of valve spindle position. Permits safe monitoring of pressure relief valves located
in hostile environments. Transducer is qualified - Class 1E. Standard system handles up to 20 Linear Variable Differential
Transducers (LVDT) Sensors. Qualified to IEEE-344 for in-containment service.
LISA - Lift Indicating Switch Assembly
A valve position indicating device with a movable permanent magnet attached to the valve spindle. Fixed “reed” type
switches are permanently encased in epoxy in the switch housing. Two sets of switches provide redundancy, with each set consisting
of three switches indicating valve closed, mid and full open positions. Qualified to IEEE-344.
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