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Positive Safety Swing Check Valves

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Positive Safety Swing Check Valves

A Emergency Shut-off  Swing Check Valve (ESOV) is a crucial component used to quickly and effectively stop the flow of gas, liquid, or vapor in emergencies or hazardous situations.

Additional information


What are Positive Safety Swing Check Valves?

Positive Safety Swing Check Valves are a type of check valve that is designed to prioritize safety. These valves are equipped with accessories that ensure reliable and secure operation in various applications. They incorporate a swing-type disc that allows flow in one direction while preventing backflow in the opposite direction.

The “positive safety” aspect refers to additional safety mechanisms implemented in these valves. For example, some positive safety swing check valves are equipped with a secondary closing mechanism, such as a spring or weighted lever, in addition to the primary swing action of the disc. This ensures a more secure and fail-safe closure, especially in critical situations.

Positive Safety Swing Check Valves are commonly used in industries where preventing backflow is crucial, such as in water and wastewater treatment plants, industrial processes, and oil and gas facilities. These valves provide peace of mind by offering enhanced safety features and reliable performance to protect equipment and prevent any potential hazards.

What are Emergency Shut-off  Swing Check Valve (ESOV)?

ESOV series of ANSI flanged swing-check valves with fusible links are created to offer a straightforward and efficient way of closing during emergencies or hazardous situations.

These valves have an external spring load and remain open thanks to the fire-sensitive fusible link. When the link melts due to fire or high temperatures, the valve automatically closes. The external lever rotates the hinge pin, causing the disc to redirect the flow of liquid, gas, or vapor.

We offer Swing Check Emergency Shut-Off Valves that have a Spring Assisted Swing Check with Fusible Link. Our ESOV series valves are available with 150# and 300# ANSI Flanged Connections in sizes ranging from 2″ to 16″.

Sizes & End Connections

  • 150# ANSI Flanged: 2″ to 16″
  • 300# ANSI Flanged: 2″ to 16″

Design Features

1. Local and/or Remote Actuation

This feature allows users to operate the valve either directly at the valve location or from a distance, giving flexibility in various operational scenarios and ensuring safety in situations where direct access to the valve is not advisable.

2. Fire-Safe Fusible Link

In the event of a fire, the fusible link is designed to melt and activate the valve to shut off, preventing further fueling of the fire and reducing potential hazards. This ensures an added layer of protection in high-risk environments.

3. Economical Solution for Required Safety

The valves are cost-effective while still meeting essential safety requirements, providing both value and protection.

4. Versatility in Service Orientation

These valves can be installed in both horizontal and vertical positions, allowing for flexibility in system design and accommodating varied installation needs.

5. Rigorous Factory Testing to API 598

Every valve undergoes a thorough testing process in accordance with API 598 standards, ensuring its reliability and performance before reaching the end user.

6. Enhanced Seal with Back Pressure

The valve’s design ensures that increased back pressure only tightens the seal between the disc and seat, reducing potential leaks and ensuring optimal performance.

7. Manual Reset for Safety

Once the valve is closed, it cannot be reopened automatically. It requires a manual reset, serving as an essential safety feature to prevent unintended or unauthorized reactivation of the flow.

Temperature Range

-20°F to 475°F


Body: Carbon steel or Stainless Steel
Disc: Carbon steel or Stainless Steel
Hanger Arm: Carbon steel or Stainless Steel
Seat: API 598 Trim 8 or 12
Cover Seal: Graphite

Fusible Link Trigger Set Temperatures Options:

  • 135˚F
  • 165˚F (Popular Standard Selection)
  • 212˚F
  • 280˚F
  • 360˚F

These are the typical applications where the material is commonly used:

– Refineries
– Petrochemical plants
– Off-shore oil rigs
– Chemical process equipment
– Water and waste applications
– Superheated steam lines on ships

positive safety swing check valves
positive safety swing check valves

















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