Swing Check Valve

Swing Check Valve

※ Bolted Cover
※ Size Range: NPS 2 to NPS 36
※ Pressure Range: 150LB to 2500LB
※ Design STD.: BS1868/ API6D
※ Swing Check Valve Manufacturer


Swing check valves, that are also known as check (flow) valves, are automated valves and are utilised to prevent the medium from flowing backwards in pipelines. The valve’s ability to open or close is determined by the pressure in the pipeline medium. It is classified into three types: single valve, double valve, and multi-valve. It is one of the most frequently utilised valves.

Swing check valves are best used in systems that have relatively cleaner fluid media. They are not ideal for working in an environment with high viscosity or high suspended solid media. Otherwise, the check valve will be unresponsive to opening and would be unable to seal completely. The swing check valve only permits one direction of flow, thereby preventing the medium from flowing back and preventing mishaps.

What is a Swing Check Valve?

The swing check valve is fitted with the gate valve as a companion. As the names implies, this valve features a swinging gate that is hinged at the top and opens as a fluid passes through it. A smooth flow passage is provided by the swing check valve when the valve disc is in the fully open position. Within the valve, this smooth channel generates low turbulence and pressure decrease. For the valve to work perfectly, there must always be a minimum pressure to open the disc. When the fluid flow reverses, the pressure and weight of the medium against the disc pushes the disc into the seat, thus preventing all backflow. Check valves are typically considered as safety or protective devices.

Working: Swing Check Valve

A swing check valve is made out of a flap or disc that swings down in the flow channel and it has the same diameter as that of the pipeline bore. A built-in rocker swing mechanism is used in the swing check valve. Except for the sealing gasket and sealing ring for the middle flange, all of the valve’s opening and closing elements are located inside the valve body and do not pierce the valve body; there is no leaking point as a whole, preventing valve leakage.

swing check valve drawing

The fluid pressure pushes the disc to swing upwards in the forward position, enabling flow through the valve. A reversal in the flow causes the disc to close against the seat, preventing the fluid from returning down the pipe. As the fluid pressure drops, the weight of the flap closes the valve owing to the gravity; however, in few circumstances, the use of a weighted lever may facilitate closing.

The swing check valve’s installation position is unrestricted. It can be placed horizontally in the pipeline, as well as vertically or in an inclined position; however, if it is positioned vertically, the medium should flow from bottom to top that is in the upward direction and the disk must be fitted so that it should not reach the stalling position otherwise it is not able to close on its own.

Construction: Swing Check Valve

A swing Check valve is made up of three parts: a valve body, a bonnet, and a disc attached to a hinge.  A swing check valve is not controlled from any external medium as it goes from completely open to a fully closed position. A variety of disc and seat designs are available to meet the needs of various applications.  In comparison with metal-to-metal seating surfaces, soft-seated–swing check valves give better leak tightness. Combination seats, which combine a metal seat ring with a resilient liner, are also more leak-proof. The sitting angle, or the angle formed between the seat and the vertical plane, can be anything between 0 and 45 degrees. The angle of vertical seats is 0 degrees. Larger seat angles minimise disc travel, leading to faster closure and a reduced risk of water hammer. The seat angles are usually between 5 and 7 degrees.

As the swing check valves are used in a larger size, the weight and travel of the disc ultimately become too much for the valve to operate properly. As a result, swing check valves with a flow channel greater than NPS 24 are typically constructed as multi-disc swing check valves, with a number of typical swing discs placed on a multi-seat diaphragm spanning the flow passage. When compared to single disc swing check valves of the same size, the length of the route along which the disc’s centre of gravity moves is reduced by nearly half, and the weight of such a disc is reduced by about half.

Technical Specification: Swing Check Valve

Size Range                        : 2” to 36”
Class Range                      : 150LB to 2500LB
Design Standard              : API 6D & ANSI B16.34, ISO 9001:2008
Inspection & Testing       : API 6D
End Connection               :Flanged; BW
Temperature Range        : -25°C to +250°C

Application: Swing Check Valve

The application of a Swing check valve is determined by its configuration. In a variety of sectors, these valves are normally used. Here are a few examples:

  • Gas Transmission: Swing check valves prevent gas from flowing in the wrong direction, which might lead to severe leaks or fires. Gas pipelines, commercial and residential gas metres, gas compressors, and other applications all use these valves as safety devices.
  • Water: Swing check valves are appropriate for fluids with high volume and steady pressure. In wastewater management and water transmission, they’re the most commonly used valves.
  • Power Plants: Silent check valves, also known as spring check valves, are a type of swing check valve that uses a spring to assist the valve close with higher precision. Silent check valves are frequently used in fluid control applications in the power generating plants, such as cooling towers. Spring check valves are best suited to high-pressure applications since opening the valve against the spring requires greater pressure.
  • Custom Design: Each system is unique, and to tackle a difficult flow issue, certain applications need a one-of-a-kind change or a totally new design. Your valve maker can help you assess if a customised solution is best for you, whether it’s as easy as altering the angle of the valve or lowering the weight of the disc.

Faults Rectification & Maintenance: Swing Check Valve

Swing check valves block and regulate the reverse flow of fluid in a system using a hinged swinging disc. Any failure can result in leakage, pressure loss, contamination, overflows, and, in the most extreme circumstances, full system failure since they are employed to prevent the reverse flow of fluids or gases. We’ll talk about some of the most prevalent reasons for swing check valve failures, how to identify them, and how to fix them in the sections below.

  • Low-Pressure Applications: Swing check valves are unable to maintain continuous flow in low-flow situations when the system lacks appropriate pressure. Due to a lack of pressure, the disc opens and closes repeatedly, generating excessive wear on the hinge pin and pivot arm to the point where the disc may completely break off. This has the potential to inflict serious harm to downstream devices.
  • Water Hammer: Water hammer is defined as an increase in pressure caused by an abrupt pause or shift in the direction of fluid flowing through a valve. Swing check valves, which rely on fluid flow reversal to close fast, are prone to this problem. The disc may break from the swing arm over time due to repetitive shutting of the disc against the valve body. Water hammer can also lead to more major system problems, such as burst pipes and broken fittings.
  • Improper Selection: Proper selection and installation of a swing check valve in a fluid system are critical for safe and dependable system functioning. To minimise inefficient functioning and early component failure, the valve chosen should be compatible with the system’s pipework, material, orientation, flow direction, and flow rate. Industry specialists should also consider location and orientation while installing the valve; the valve should not interfere with or be impacted by other system components, and it should be orientated appropriately in regard to flow. In the application where the flow is vertically down, swing check valves will not operate.

There are many ways to determine the faults in swing check valves, some of those are:

  • A tapping or hammering sound is produced when the disc opens and shuts repeatedly or aggressively. While the swing check valve may not be damaged at this time, these noises indicate that the disc, swing arm, and hinge pin are under a lot of stress, which will eventually lead to degradation and failure over time.
  • Swing check valves may also stick as they degrade. When the valve is continuously tapping at the top of the valve body and peening over the casting material, the valve will get stuck. This repeated operation has the potential to seize the disc and keep it from closing. Leakage or damage to other system components may occur as a result of these operating circumstances.

Regular maintenance of a swing check valve will prevent it from failure. The steps involved in maintenance are as follows:

  • Examine the sealing surface for signs of wear and tear. If there is any damage, it should be repaired or replaced.
  • Inspect the gasket for any damage or failure and replace it as soon as possible.
  • Check to see that the bolts that are attached are secure.
  • When checking and fixing the valve while it is dismantled, seat tests must be performed after it is reassembled. Keep careful documentation for future reference.

Top 5 Swing Check Valve Manufacturers

Company Name: Plastic Corporation
Type of Business: Swing Check Valve Manufacturer
Company’s Address: 1390 Neubrecht Rd. Lima, OH 45801
Contact Information: usp@usplastic.com, 419-228-2242
Other Products: Butterfly, diaphragm, pressure relief, needle, gate, globe and solenoid valves.
Applications: Water Supply, Water Treatment, Domestic Purpose, etc.

Company Name: NIBCO INC.
Type of Business: Manufacturer
Company’s Address: 1516 Middlebury Street P.O. Box 1167 Elkhart, IN 46515-1167
Contact Information: CustomerService@nibco.com, +1/574.295.3221 
Other Products: Gate, Globe, Ball, Butterfly, Chemtrol, Fire Protection Valves, etc.
Applications: Oil & gas, power, petrochemicals, chemicals, water, defence and aerospace.

Type of Business: Swing Check Valve Manufacturer
Company’s Address: 15 Pruyn’s Island Drive Glens Falls, NY 12801 USA
Contact Information: 1-800-833-2040
Other Products: Air release/ Vacuum, Automatic Control, Backflow preventers, Breakoff Plugs,
Butterfly, Constant Pressure Pump Control Valves, etc.
Applications: Water & Wastewater valves support in Domestic, Industrial, Irrigation uses, etc.

Company Name: Val-Matic Valve & Mfg. Corp.
Type of Business: Manufacturer
Company’s Address: 905 Riverside Drive Elmhurst, IL 60126
Contact Information: 630-941-7600
Other Products: Air, Ball, Butterfly, Control, Plug Valves, Paper & Pulp, etc.
Applications: Oil & Gas, Shipbuilding, Plant Engineering, Petrochemicals, etc.

Company Name: Valve Check, Inc.
Type of Business: Swing Check Valve Manufacturer
Company’s Address: 1081 Hwy 36 E, Maplewood, MN 55109
Contact Information: (651) 330-3437
Other Products: Custom check, custom relief, custom manifolds, cartridge, non-return, tank, needle, ball, valve pistons, cylinder, oxygen, bleed valves, poppets and more. 
Applications: Medical, Dental, Aerospace, Automotive, Oil/Gas, Cryogenics, Chemical
 Processing, Agriculture, Pneumatics, Hydraulics, Food/Beverage, Fire Protection, HVAC, and More!


Swing check valves are both inexpensive and simple to maintain. They’re a highly recommended valve for various horizontal pipe applications since they don’t require any external power. As a swing check valve manufacturer, we provide a wide selection of valves in a variety of sizes, as well as other metal and plastic valves. You can reach out to us and one of our specialists will assist you in determining the ideal valve solution for your needs.

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