Check Valves

Check valve is a valve referred to the opening and closing parts for the circular disc and by its own weight and medium pressure to block the media flow back.

It belongs to automatic valve class, also known as check valve, check valve, return valve or isolation valve. Disc movement is divided into lifting type and swing type. Lift check valves are similar in construction to globe valves except for the lack of a stem to drive the disc. The medium flows from the inlet end (the lower side) and flows from the outlet end (the upper side). The valve is opened when the inlet pressure is greater than the sum of the weight of the disc and its flow resistance. On the contrary, the valve is closed when the medium flows backwards. Swing check valves have a tilt and can rotate around the axis of the disc, the working principle is similar to the lift type check valve.

Check valves are often used as bottom valves in pumping devices to prevent water from returning. Check valve and globe valve combined use, can play the role of safe isolation. The disadvantage is that the resistance is large, and the sealing is poor when it is closed.

Design feature of Check valve

Design	API594, ASME B16.34
Testing	API 598, API6D, EN12266-1
Face to face dimension	ASME B16.10
Ends connection	ASME B16.5, ASME B1.20.1, ASME B16.25
Pressure temperature rating	ASME B16.34
Marking	MSS SP-25
Non-destructive Examination	VT, PT, RT, UT, MT

Types Of Check Valves

Titanium Check Valves

Nickel Check Valves

Monel Check Valves

Hastelloy Check Valves

Inconel Check Valves

Duplex Check Valves

Super Austenitic Check Valves

NAB C95800 Check Valves

Stainless Steel Check Valves

Zirconium Check Valves

Tantalum Check Valves Tantalum Check Valves

Weidouli supply of many types of Check Valves

Swing Flanged Check Valves

A basic swing Check valve consists of a valve body, a bonnet, and a disk that is connected to a hinge. The disk swings away from the valve-seat to allow flow in the forward direction, and returns to valve-seat when the upstream flow is stopped, to prevent backflow.

The disc in a swing type Check valve is unguided as it fully opens or closes. There are many disk and seat designs available, in order to meet the requirements of different applications. The valve allows full, unobstructed flow and automatically closes as pressure decreases. These valves are fully closed when flow reaches zero, in order to prevent backflow. Turbulence and pressure drop in the valve are very low.

Lifting Flanged Check Valves

Lift Check valves are particularly suitable for high-pressure service where velocity of flow is high. In lift Check valves, the disc is precisely guided and fits perfectly into the dashpot. Lift Check valves are suitable for installation in horizontal or vertical pipe-lines with upward flow.

Dual plate wafer check valves

Dual Plate Wafer Check Valves were originally introduced in the late 1950s and quickly became the check valves of choice for many piping engineers because of their proven reliability and low-pressure drops. They have become the standard for process and project engineers worldwide and are used extensively in Power Plants, Refineries, Chemical Plants, Wastewater Treatment Plants and Pulp & Paper Mills.

Nozzle Check Valves

Nozzle check valves are incredibly useful for water pipelines and systems. These valves are engineered to control and protect against pressure surges that can occur in water lines. They also work to prevent water hammer and reverse flow.

Nozzle check valves are constructed with a spring-assisted disc. When fluid pressure in the valve is higher than the cracking pressure, or the pressure needed to open or close the valve, the spring lowers the disc to prevent reverse flow.

The valve is also manufactured to include a guide to keep the disc moving in a vertical. This allows it to re-seat properly.

Weidouli Valves Co., Ltd.,is a professional check valve company, we provide different types of non return valve, check valve china, duo plate check valve, fuel non return check valve, wsv valves, manual valveand etc. Want to know check valve types and applications? Please contact us.

Other supplier products

	What Is The Difference Between Gate Valve And Globe Valve?	What Is The Difference Between A Gate Valve And A Globe Valve ? It is important to understand the difference between the gate valve and the valve ...
	Duplex Globe Valves	The microstructure of the duplex stainless steel globe valve consists of a mixture of an austenitic phase and a ferrite phase. Therefore, the duple...
	Duplex Ball Valves	Duplex ball valves have the advantages of both ferritic stainless steel and austenitic stainless steel: austenitic stainless steel reduces the brit...
	Duplex Butterfly Valves	Duplex steel valves have good corrosion resistance and high strength performance because of their material character. So-called "duplex stainless s...
	Hastelloy Ball Valves	Hastelloy ball valvescontain ultra-low carbon and high Ni, Mo and Cr elements, which belong to corrosion-resistant and high temperature-resistant m...

All supplier products

Same products

	Shoes Flexing Tester	Seller: Qinsun Instruments Co., Ltd	It's used for determining the flexibility resistance and or indicating the cracks od shoe or shoe...
	Shoelace Abrasion Tester	Seller: Qinsun Instruments Co., Ltd	Application: This shoelace abrasion tester is used for shoelace against standard eyelet abrasion...
	Heel Fatigue Tester	Seller: Qinsun Instruments Co., Ltd	Heel Fatigue Tester is used to determine the resistance of medium and high heels of ladies’...
	Heel Impact Tester	Seller: Qinsun Instruments Co., Ltd	Heel Impact Tester is used to determine the impact strength of heels of ladies’shoes. Ap...
	Ross Flex Tester	Seller: Qinsun Instruments Co., Ltd	Whole Sole ROSS Flexing Tester GT-KB05D To determine right angle flexing risistance for whole sol...