Pressure Protection and Relief Valve Products
ControlWorx is an industry leader in pressure relief valve technology. A single point provider, we offer an extensive product line for reliable performance with lower valve life-cycle costs. Our unmatched engineering and technical expertise provides you with the pressure management products, application solutions and services that will positively impact your business.

Anderson GreenwoodAnderson Greenwoord Products
Anderson Greenwood Pressure Relief Valves
ControlWorx proudly represents Emerson and the recently acquired pressure relief valve brands Anderson Greenwood and Crosby. Anderson Greenwood pressure-relief valves provide advanced, reliable, and efficient overpressure protection. With more designs than any manufacturer worldwide, Anderson Greenwood product technology solves applications from the most severe to the very basic service conditions

- Direct Spring Pressure Relief Valves
- Pilot Operated Pressure Relief Valves
- Safety Selector Valves
- ASME Section I and Section VIII Accreditations V & UV
- Low Pressure Pilots

Anderson Greenwood brand is regarded as a worldwide technology leader in research, design, and manufacture of high quality premium performance pilot-operated and direct spring-operated pressure-relief valves as well as specialty products such as safety selector valves. In the highly specialized field of pressure relief devices, no manufacturer can match the diversified products, designs, and application experience of Anderson Greenwood. The product technology of Anderson Greenwood solves applications for gas, liquid, steam, and multi-phase flow conditions in offshore oil and gas production, gas processing, refining, petrochemical, and chemical processing systems.



Pilot Operated Pressure Relief Valves





Series 200/400/500/700/800 Pilot Operated Valves

Up to 6171 psig

 -423°F - +550°F

NPS 1-8

Series 5200 Pilot Operated Valves

Up to 3000 psig

 Up to 698°F

NPS 1.5 -8

Series MLCP Pilot Operated Valves

Up to 15 psig

 -20°F - +400°F

NPS 2-6

Direct Spring Operated Pressure Relief Valves





Series 60/80 Direct Spring Operated Valves

Up to 10,000 psig

-423°F - +550°F 

NPS ½-2

Anderson Greenwood, Safety Selector Valves
A dual pressure relief device system that provides a safe, efficient method of switching from an active PRV to a standby, maintaining system overpressure protection.
Anderson Greenwood, Safety Selector Valves
Liquid/two phase service Safety Selector Valves can be used in gas/vapor, steam, liquid or two-phase service. Section I steam service as per ASME Section I Boiler and Pressure Vessel Code Case 2254, the Safety Selector Valve can be installed to provide a back-up safety valve for boilers with a maximum allowable working pressure (MAWP) of 800 psig or less. The code case requires that the switchover device must provide: positive locking, external bleed valves, certified Cv values. The SSV will provide the highest flow efficiency (Cv) of any switchover device in the same nominal pipe size, enabling it to be used with most manufacturers’ flanged Section I Boiler valves. To ensure complete compliance with the code case, please provide the model number and set pressure of the safety valves to be used.

PRV ChangeOver Device





Safety Selector Valve

Up to 6002 psig

 -425°F - +801°F

 NPS 1-10


Crosby Products


Crosby Pressure Relief Valves
A market leader in direct spring PRV technology, Crosby was the first to certify on liquid service and one of only a few in the ASME Section I and Section III markets. Since 1874, Crosby direct spring-operated safety and relief valves have been among the world’s most widely used relief valves for gas, liquid, steam, and multi-phase applications in oil and gas production, refining, petrochemical, and chemical processing systems. They are also used for utility and industrial steam generators, and steam systems in power generation facilities.

- Direct Spring Pressure Relief Valves
- ASME Section I and Section VIII
- Including Restricted Lift Capabilities

Direct Spring Operated Pressure Relief Valves






Up to 125 psig

-15°F - +399°F

NPS 1-8

H Series Direct Spring Safety Valves

Up to 2700 psig

-450°F - + 1000°F

NPS 1-6

OMNI-TRIM Direct Spring Pressure Relief Valves

Up to 1500 psig

 -450°F - + 750°F

NPS ¾-2

JB and JPV-A, large Orifice Pressure Relief Valves

25 to 300 psig

 -20°F - +450°F

NPS 10x14 -20x24

***ControlWorx is very proud to introduce availability of the full line of Restricted-Lift J-Series Valves and Dual-Certified JLT-JOS-E/JBS-E Series.
Please contact our application specialist for more information at

Enardo Products
Enardo - Total Tank Protection, Inside and Out
For more than 80 years Enardo has supplied industry with the products, services and solutions that meet the challenges of environmental and safety standards. Enardo is a world leader in the development and manufacture of vapor control equipment used anywhere liquids and gases are processed or stored:

- Flame and Detonation Arresters
- Pressure and Vacuum Relief Valves
- Emergency Relief Vents
- Tank Hatches Varec Products

As global industry moves toward cleaner and greener processes, Enardo is meeting the challenges to provide innovative storage tank safety and environmental solutions. Enardo understands the mission-critical role your products play in protecting life, equipment, and the world around us.

Varec LogoVarec Tank

Varec Tank Protection
Varec offers structural and environmental protection devices for low-pressure storage tanks throughout the oil and gas, chemical, petrochemical, and wastewater industries.

Varec tank protection products provide vapor and fugitive emissions control in addition to fire and explosion protection through an integrated line of conservation and emergency vents, flame arresters, regulators, gauge hatches, manway covers, and floating suction units. With the Varec line of products, in combination with Anderson Greenwood tank products (low-pressure pilot-operated relief valves, blanketing regulators, specialty tank valves) and Whessoe tank products (venting and flame arresters), Emerson provides a full set of tank protection options.


Fike LogoThe Fike Expertise
Fike Rupture DiscsFor over 70 years Fike has been the leader in pressure solutions and rupture/bursting disc innovation. Fike products are compliant with a wide variety of code regulations around the globe and are designed to meet or exceed industry requirements for performance, reliability and quality. From safeguarding your critical manufacturing process to protecting your pressure relief valves (PRVs), Fike products are part of the critical path to lowering your costs and helping you achieve higher profitability.

Why Pressure Relief Technology?
A rupture disc is designed to p
rovide a leak tight seal within a pipe or vessel until the internal pressure rises to a predetermined level. At that point the disc bursts preventing damage to the equipment from overpressure.

Fike’s G2 Technology

G2 is a patented, state-of-the-art technology used to manufacture rupture discs without hard-score tooling, producing no stress zones that can fatigue and offering premium performance. The result is a low pressure rupture disc solution featuring tight burst tolerances and extremely high operating ratios. In addition, the advanced automation significantly increases consistence and provides for fast, economical delivery time.


Hyspan LouisianaHyspan - Providing Exceptional Pipe Motion SolutionsHyspan Louisiana
Hyspan is the single source for expansion compensation, seismic and vibration isolation. Only Hyspan manufactures all 4 piping motion technologies: metal bellows expansion joints for axial and offset, packed slip joints, ball joints, and metal hose connectors. Since 1968, Hyspan products provide unequaled ability to solve piping issues.

Hyspan maintains a staff of engineers and quality personnel experienced in the design, development and testing of metal bellows expansion joints, packed slip expansion joints and ball joints for industrial applications including the most severe operating and environmental high pressure ball joint conditions. Company standards and registrations include the ASME Boiler and Pressure Vessel Code including a "U" stamp, the European Pressure Equipment Directive and the Canadian Boiler and Pressure Vessel Registration. The company is a member of the Expansion Joint Manufacturers Association.