Crosby Relief Valves

Crosby Relief Valves with direct spring-operated safety and pressure relief valves are among the world’s most widely used for oil and gas production and refining, petrochemical and chemical processing, and conventional and nuclear power.

About Crosby Relief Valves

Crosby pressure relief valves maintain the industry’s most extensive and capable flow facilities for testing in air, steam, and water. CHASE International enjoys both a close geographical and business relationship with this brand through its association with Emerson. This close proximity to Emerson affords us complete access to the technical and manufacturing infrastructure of this organization. Due to the collaborative nature of the working relationship we are confident of always supplying to your specifications, for both current and past product ranges.

Crosby supports a wide range of heavy industry applications and is known for its beyond-limits approach to unique customer applications. Crosby also maintain the industry’s most extensive high-flow facilities for valve testing on air, steam, and water.

The Products of Crosby Relief Valves

Crosby HL High Capacity, Flanged Steel Direct Spring Valve

High capacity, two-ring control, full nozzle safety valve for saturated and superheated steam service. The Crosby Style HL Safety Valve is a high-capacity, flanged steel safety valve specifically designed in accordance with ASME Section I and Section VIII.

Features & Benefits:

• The guide is held in place using the method employed by all the leading high-pressure safety valve manufacturers, thus eliminating the age-old industry problem of the guide-to-body threads corroding in service, which can require major repairs.
• The HL valve has a full nozzle that threads into the body, making it easy to remove and less expensive to repair should it be damaged in service. The full nozzle is designed with spanner wrench slots for easy removal and installation.
• An external blowdown adjustment makes final minor blowdown adjustments in the field very easy and minimizes the testing time.
• The HL’s Flexi-Disc®, which is more common in high-pressure safety valves, offers improved seat tightness.
• The specially designed cover and overlap collar form a unique back pressure chamber for improved blowdown and prevent steam from heating the spring, which might affect set pressure.
• The built-in mechanical lift stop prevents over lift and ensures stability during the relieving cycle.

Crosby JB and JPV-A Large Orifice Pressure Relief Valve

The large orifice pressure relief valve product line is an extension of API Standard 526 designs for air, gas, steam, and vapor applications. The broad JB-TD product offering represents an alternative to multiple, smaller orifice relief valves.

Features & Benefits:

• The broadest product offering in the industry.
• Ten sizes are available.
• Reduced installation and labor costs (1 valve versus multiple smaller valves).
• Fewer discharge lines.
• Fewer inlet connections.
• Reduced maintenance costs.
• Fatigue-resistant bellows material.

Crosby Series 800 Direct Spring Operated Pressure Relief Valves

Adjustable blowdown design for medium flow of air, gas, vapor, and steam applications. External precise blowdown adjustment provides shorter blowdown than the Series 900. Full nozzle design. Available with metal or O-ring seats.

Features & Benefits:

• Relieving capacities certified by the National Board of Boiler and Pressure Vessel Inspectors. Certification includes air and steam.
• Valves manufactured in accordance with the requirements of ASME Boiler and Pressure Vessel Code Section VIII and Section III.
• Superior seat tightness. Precision-lapped flat metal-to-metal seats, or elastomer or TFE O-ring soft seats provide the ultimate in seat tightness.
• Maximum corrosion resistance. Trim components are stainless steel as standard. All 316 stainless steel, Monel®, Hastelloy® and NACE* optional constructions are available.
• Spring standardization. Suitable for inlet temperatures to 750°F [399°C], using a 17-7PH stainless steel spring.
• Positive built-in lift stop.
• Fewer parts result in increased reliability and ease of maintenance.
• Series 800 pressure relief valves have an external blowdown adjustment allowing for short blowdown, smaller differential between operating and set pressures, and reduced product loss.

Crosby Series 82 Direct Spring Operated Pressure Relief Valve for Natural Gas

The Crosby Series 82 direct spring operated valve is designed to provide premium performance in the natural gas market. The Series 82 has a rugged construction designed specifically for high-pressure multi-stage natural gas compressors. The Series 82 valve is designed to provide superior seating performance using a Viton® o-ring seat. The 2-piece body design with replaceable seats and seals reduces downtime and maintenance costs over the life of the valve.

Features & Benefits:

• Rugged design for the natural gas industry.
• Leak-tight performance near set pressure. Allows higher operating pressures resulting in increased process throughput and system optimization.
• Viton® soft seat as standard. Provides repeatable leak-tight performance before and after each relief cycle.
• Superior seat tightness bubble tight at 90% or better of set pressure.
• Replaceable soft seat provides ease of seat replacement which results in lower long-term maintenance costs.
• The valve is manufactured in accordance with the requirements of ASME Section VIII UV for gas service.
• ASME-certified capacities. Relieving capacities certified by the National Board of Boiler and Pressure Vessel Inspectors.
• Maximum corrosion resistance. Trim components 316 stainless steel as standard.
• NACE trim as an option. Compliance to NACE MR-0175 (2002 Edition).
• Gas Service only.

Crosby Series 900 OMNI-TRIM® Direct Spring Operated Pressure Relief Valves

Single trim design, fixed blowdown design for medium flow of air, gas, steam, vapor, liquid and two phase applications. Full nozzle design. Available with metal or O-ring seat construction.

Features & Benefits:

• Relieving capacities certified by the National Board of Boiler and Pressure Vessel Inspectors. Certification includes air, steam and water for Series 900.
• Valves manufactured in accordance with the requirements of ASME Boiler and Pressure Vessel Code Section VIII and Section III.
• Superior seat tightness. Precision-lapped flat metal-to-metal seats, or elastomer or TFE O-ring soft seats provide the ultimate in seat tightness.
• Maximum corrosion resistance. Trim components are stainless steel as standard. All 316 stainless steel, Monel®, Hastelloy® and NACE* optional constructions are available.
• Spring standardization. Suitable for inlet temperatures to 750°F [399°C], using a 17-7PH stainless steel spring.
• Positive built-in lift stop.
• Fewer parts result in increased reliability and ease of maintenance.
• Use a single-trim design for liquid, gas, and vapor services.
• Provide reliable blowdown without the need for adjustment.

Crosby Series BP OMNI-TRIM® Balanced Threaded Pressure Relief Valve

Crosby Series BP OMNI-TRIM® Pressure Relief Valve is a piston, single trim designed valve for gas, vapor, and liquid applications involving variable back pressure. Full nozzle design with O-ring seat as standard.

Features & Benefits

• The balanced piston design offsets the effects of variable back pressure on valve set pressure. Series BP valves can also handle applications involving high built-up back pressure.
• Cost Reduction
  • Reduced replacement parts inventories required with unique and versatile designs approved for both liquid and vapor applications.
  • Maximum corrosion resistance with stainless steel trim. All 316 stainless steel, Monel®, Hastelloy®, and NACE1 optional construction are available.
  • Inexpensive O-rings are the only recommended spare parts.
  • Reduced piping requirements.
  • Costly bellows are not required.
• Reduced Product Loss
  • Minimized product loss with superior seat tightness.
• Increased Reliability
  • Fewer parts in a streamlined design.
  • Reliable blowdown without the need for adjustment.
• Certifications
  • Relieving capacities certified by the National Board of Boiler and Pressure Vessel Inspectors. Certification includes liquid, gas, and vapor.
  • Valves manufactured in accordance with the requirements of ASME Boiler and Pressure Vessel Code, Section VIII and Section III.

Crosby Series JOS-E, JBS-E, JLT-JOS-E, JLT-JBS-E, JOS-H-E Spring Loaded Flanged Valves

Conventional and Balanced Bellows Spring loaded pressure relief valves built in accordance with API Standards 526 and 527 for air, gas, steam, and vapor. Styles JLT-JOS-E and JLT-JBS-E for liquid service and two-phase applications.

• Series JOS-E and JBS-E Spring-Loaded Pressure Relief Valves
• Series JLT-JOS-E and JLT-JBS-E Liquid Trim Pressure Relief Valves

Features & Benefits

• Rugged nozzle ring design.
• Improved disc insert retention for ease of maintenance.
• Standard Inconel® 625 bellows and flange material for superior corrosion resistance, longer service life and a wider range of applications.
• Universal disc holder allows for simple and cost-effective conversions from conventional to balanced bellows design.
• Standard threaded bellows design for ease of maintenance and conversion from conventional to balanced bellows design.
• Optional welded bellows attachment is available for special applications.
• Series JLT capacities certified on liquid and gas.
• Improved parts interchangeability, regardless of top construction.
• Field-proven series JLT trim (patented) for stable, non-chattering operation on liquid and gas service.
• Standard chrome steel spring for -75°F to +650°F [-59°C to +343°C].
• Easily converted to any type cap or lifting lever construction, liquid trim, soft seat or balanced bellows configurations.
• Full compliance with ASME Boiler and Pressure Vessel Code Section VIII and API Standards 526 and 527.

Crosby Style HSL – Drum and Superheater Outlet Service Valves

Crosby Style HSL is a full nozzle reaction type safety valve designed for saturated and superheated steam service. The design is suitable for set pressures to 725 psig [50 barg] and temperatures to 1000°F [538°C], with high capacities, two choices of inlet flange ratings, and a simplicity of design to facilitate ease of maintenance.

The HSL design meets the requirements of ASME Code Section I, Power Boilers and relieving capacities are certified by the National Board of Boiler & Pressure Vessel Inspectors. Style HSL may also be used in steam service applications covered by ASME Code Section VIII requirements.

Features and Benefits

• FLEXI-DISC® seat design: recessed for pressure and temperature equalization. Ensures a flat and tight seal.
• High coefficient of discharge: results in the most economical valve selection.
• Replaceable full nozzle design: facilitates ease of maintenance and longer service life. Nozzle removal requires no special tools.
• Seat tightness: FLEXI-DISC seat capable of containing system pressure at 94% of set pressure. Standard seat tightness testing conducted at 93% of set pressure.
• Single bonnet design: allows set pressure changes without the need to change out any components besides the spring.
• Back pressure limit: 27.5% of set pressure

Crosby Style JQ Pressure Relief Device

Designed in collaboration with the Chlorine Institute, Inc. the Crosby JQ is designed with internal parts completely isolated from corrosive fluids and environments. The Crosby Style JQ pressure relief device was designed to provide dependable overpressure protection for vessels used for the transportation and storage of chlorine and other dangerous commodities.

It is ideally suited for such service, being completely sealed from hazardous fluids and corrosive environments until the time of an overpressure event. Diaphragm seals at both the inlet and outlet of the Crosby JQ effectively prevent the corrosion of internal working parts while also preventing the escape of fugitive emissions. These unique valves are in use worldwide on railroad tank cars, barges, and on stationary vessels, adding a measure of reliability and a level of safety beyond that possible with a conventional pressure relief valve.

The JQ is available in two inlet sizes, 1-1/2″ and 4″. The pressure limit for 1-1/2″ size is 450 psi, and for the 4″ size, 375 psi. The 1-1/2″ device is equipped with a special Chlorine Institute-approved inlet flange and metal-to-metal seat. A 1-1/2″ 300 lb ANSI raised face flange adapter is available as an option as is an elastomer O-ring seat for exceptional tightness. The 4″ device has a standard 4″ 300 lb ANSI large tongue-faced inlet flange and metal seat (a raised-face flange is available as an option).

Features and Benefits

• Designed in collaboration with the Chlorine Institute, Inc. to eliminate detrimental corrosive effects on valve parts which could render the valves inoperable.
• Association of American Railroad Approval Nos. SRD-989034 and SRD-989035.

Crosby Style PVR Pressure/Vacuum Pressure Relief Valve

Designed for the food & beverage and pharmaceutical industries, the PVR relieves excess air or gas pressure, relieves excess liquid pressure in the absence of air or gas blanketing, and prevents the formation of a vacuum that could cause the vessel to buckle due to external pressure.

Features & Benefits:

The Crosby Style PVR pressure/vacuum relief valve is a sanitary valve designed specifically for the brewing, beverage, food processing and pharmaceutical industries. This valve provides overpressure protection in three modes of self-actuated operation:

1. Relieves excess air or gas pressure;
2. Relieves excess liquid pressure in the absence of air or gas blanketing; and
3. Designed to prevent the formation of a vacuum that could cause the vessel to buckle.

The pressure/vacuum relief valve is manufactured in accordance with ASME Code Section VIII requirements. Valve capacities on compressible fluid are certified by the National Board of Boiler and Pressure Vessel Inspectors. The valve body and all internal parts are designed to operate after exposure to process fluids and to withstand direct flushing and cleansing of sterilizing agents, caustics, water or steam.

Further, the configuration of each valve piece permits complete drainage after valve operation and/or flushing, and minimizes crevices which might trap contaminants or promote freezing in cold environments.

Crosby’s PVR is a versatile design featuring reliable and trouble-free operation. The valve set pressure may be adjusted by the stainless steel adjusting bolt which is also the pressure relief disc guide. The pressure relief disc in turn guides the vacuum disc and spring. Vacuum relief set pressure is pre-set at the factory and is non-adjustable. The cap is sealed with a lead seal to prevent tampering. Tight shut-off is provided by standard Viton® O-ring seats on both discs. All valve materials are corrosion resistant and all exposed surface finishes are controlled to enhance the sanitary features of the valve.

Crosby Styles HE ISOFLEX®, HCI ISOFLEX®, HSJ Safety Valves

High-capacity safety valve for drum service, and saturated steam applications. Two-ring control and back pressure-assist close design are standard. ISOFLEX® seat design provides seat tightness up to 96% of set pressure.

Features & Benefits:

Style HE ISOFLEX®

• High capacity, back pressure assisted close, safety valve
• High-pressure drum service
• Saturated steam applications
• Two-ring control
• Seat tightness* at 96% set pressure
• Welded and flanged inlets

Style HCI ISOFLEX®

• High-capacity safety valve
• Saturated and superheated steam
• Two-ring control
• Restricted/adjustable lift option
• Seat tightness* at 96+% set pressure
• Welded and flanged inlets

Style HSJ

• High-capacity safety valve
• Saturated and superheated steam
• Two-ring control
• Tight shut-off FLEXI-DISC®
• Flanged Inlet

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