Carbon Steel Swing Check Valve

 

A check valve, also known as a non-return valve, reflux valve, retention valve, foot valve, or one-way valve, is a device that normally allows fluid (either liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, featuring two openings in their bodies: one for fluid entry and the other for fluid exit. Various types of check valves are used in a wide range of applications, including common household items. Although available in various sizes and costs, check valves are generally small, simple, and inexpensive. They operate automatically, without human or external control, and most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

 

Carbon Steel Swing Check Valves are widely recommended by engineers and operating personnel. They are well-proportioned, and robust, and offer the perfect solution wherever check valves are needed in water and wastewater treatment facilities. These valves boast a carbon steel body and incorporate a full-opening swing design. When fully open, the valve disc swings out of the flow path, enabling a "full flow" through the valve that matches the nominal pipe diameter. The design and manufacturing standards comply with the most recent revision of API 6D.

 

Typically, the operation of a swing check valve relies on gravity (the weight of the disc) and reverse flow. The pivot point of the swing check is located outside the periphery of the disc. The greater the flow velocity and head pressure, the greater the valve closing force. To prevent the disc from slamming and reducing hydraulic shocks, an external hinge arm is available, equipped with either a lever weight or an adjustable spring.

 

The main construction features of the GZP Swing Check Valve are as follows:

● Built-in Trim Structure Design

The GZP check valve incorporates a built-in structure, with the valve disc and hinge arm nestled within its internal chamber. This design ensures no disruption to the flow and minimizes potential leakage points.

 

● Comprehensive Body Seat Options

The body seat can be either integrally forged or rolled, or it can be welded and overlaid with various materials. The welding overlay process strictly adheres to approved WPS procedures. After welding and all necessary heat treatments, the seat ring surfaces undergo precision machining, thorough cleaning, and rigorous inspection before proceeding to assembly.

 

● Convenient Installation with Lifting Ring for Large Sizes

For larger sizes, a lifting ring is provided to facilitate easier installation. Swing check valves can be installed in either a horizontal or vertical orientation.

 

Technical Data
Design Standard	API6D, BS1868, DIN3356,EN10739
Body Material	A216WCB, A217 WC6,A217WC9,
	NACE MR-01-75/NACE MR-01-03 Special Requirements
Pressures range	ANSI 150 ~ANSI 2500 ,PN10~PN420
Size range	DN50(2") ~DN1200 (48")
Face to Face	ANSI B16.10,EN 558,DIN3202
Flanged RF, FF, RTJ Ends	ASME B16.5 ≤ DN600 (24") ASME B16.47 A ≥ DN650 (26")
	BS 4504, DIN 2543-2545, EN1092
Butt-Weld BW Ends	ASME B16.25 ,DIN 3239,BS 2080, EN 12627
Temperature range	-29°~ 600°C
Design Feature
Construction	Swing type, Wafer type,
Disc Type	Dual plate, single plate,
Seat Sealing	Integral body seat, seat welded and overlaid
Fire Safe Design	API 607, BS 6755
Inspection & Test
Visual Inspection	MSS SP-55
Material Inspection	PMI Test----Chemical Analysis
	HB Test---Hardness Test
	UT---Ultrasonic Test
	RT---RadiographicTest
	MT---Magnetic Test
	NDT Test Non-destructive
Dimension inspection	According to drawings
Valve Inspection and Test	API 598, DIN 3230, EN 12266, BS 5146

 

How Does a Swing Check Valve Work?

Swing check valves, resembling butterfly valves in operation, employ a hinged disc to regulate flow. This disc, akin to a circular door, swings open with the force of liquid, ensuring unobstructed passage when aligned with the correct flow direction.

 

When liquid flows in the intended direction, the pressure opens the swing check valve, allowing the liquid to pass through. Conversely, if the liquid flows in the opposite direction, the force of the liquid pushes the disc against its seat, closing the valve. Proper installation of a swing check valve is crucial to ensure it opens when liquid flows in the desired direction. If no water passes through after installation, the valve is installed incorrectly and needs to be reinstalled. Swing check valves with a union design can be easily removed from the pipeline for adjustment or replacement.

 

Swing check valves operate by allowing a flapper to swing away from its seat, enabling the forward flow of fluid or gas. When the flow needs to be halted, the decreasing system pressure causes the flapper to swing back onto its seat, automatically closing the valve. These valves are renowned for their high flow capacity.

 

Swing check valves are versatile and find applications in various systems, including sewage and wastewater treatment, firefighting operations, power plants, and even household devices. A familiar instance is the swing check valve used in toilet tanks, which allows water to enter while preventing backflow.

 

Swing check valves, made from metal or PVC, are ideally suited for pipes with a consistent fluid flow. However, they can be damaged by repeated sudden pressure changes, leading to leaks (a phenomenon known as bypassing) because the valve may not seal properly against its seat under such conditions.

 

Swing check valves offer a simple yet effective solution across various industries. Here are some examples:

Power Plants: In power generation, silent check valves (also known as spring check valves) are a variant of the standard swing check valve. They use a spring to control the valve's closure more precisely and are commonly used in fluid control applications such as cooling towers. Since these valves require more pressure to open against the spring, they are particularly well-suited for high-pressure environments.

Natural Gas Transmission: Swing check valves play a crucial role in preventing improper gas flow that could lead to hazardous leaks or fires. They are extensively used in natural gas pipelines, commercial and residential gas meters, gas compressors, and related applications.

Oil and Gas Refineries: To address water hammer-a pressure wave caused by sudden valve closure-refineries often employ non-slam check valves, which are specially designed to mitigate this issue.

Horizontal Water Lines: Swing check valves are optimal for scenarios involving high-volume, consistent-pressure fluid flow. They are the most common valve type used in wastewater treatment and water pumping systems.

 

Custom Solutions

Given the unique requirements of each system, sometimes specific applications necessitate tailored modifications or entirely original designs to tackle challenging flow issues. These adjustments can be as simple as changing the valve's angle or reducing the weight of the disc. Collaborating with your valve manufacturer can help determine if a customized solution is appropriate for your needs.

 

FAQ

Who are we?
We are based in Zhejiang, China, and have been operating since 2013. Our products are sold to Southeast Asia (50.00%), South America (20.00%), North America (12.50%), South Asia (10.00%), Eastern Asia (2.00%), and Eastern Europe (1.00%). Our office employs between 51-100 people.

 

How can we guarantee quality?
We ensure quality by providing a pre-production sample before mass production and conducting a final inspection before shipment.

 

Why should you buy from us instead of other suppliers?
We are a professional manufacturer of stainless steel ball valves with 25 years of production experience. Our strong technical expertise, advanced CNC machine tools, and comprehensive testing equipment lay a solid foundation for high-quality products.

 

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