KATA CHECK VALVE

A check valve allows fluid to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem.

Design Features
Seat
For carbon steel check valves, the seat material is usually forged steel. The sealing surface of the seats is spray welded with hard alloy specified by the customer. Renewable threaded seats are used for NPS≤10 check valves, and welded-on seats are optional. Welded-on seats are used for NPS≥12 carbon steel gate valves. For stainless steel check valves, an integral seat is usually utilized, i.e. by welding hard alloy directly within body cavity. Threaded-in or welded-on seats are also optional for stainless steel check valves, if required.

Body-Cover Gasket

Stainless steel + flexible graphite wounded gaskets are used for Class 150 and Class 300 check valves; stainless steel flexible graphite wounded gaskets are used for Class 600 check valves, a ring type joint gasket is used for Class 900 check valves; a pressure seal design is used for Class 1500 and Class 2500 check valves

Body-Cover Connection
The body and bonnet of Class150 to Class 900 check valves are usually connected by with studs and nuts. And the body and bonnet of Class 1500 to Class 2500 check valves usually utilize a pressure seal design.

A check valve, clack valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. Typically the check valve is designed for and can therefore be specified for a specific cracking pressure.

Heart valves are essentially inlet and outlet check valves for the heart ventricles, since the ventricles act as pumps.

Check Valves

also known as clack valves, one-way valves, or non-return valves—for the oil, gas, and petrochemical industries. Check valves are made so that fluid is only allowed to flow in one direction through the valve – there are usually two openings within the valve, one for the fluid to enter and one for the fluid to exit. Our check valves are guaranteed to eliminate backflow issues and allow liquid to safely flow in one direction. We offer a variety of types of check valves suitable for a variety of applications often related to the petrochemical industry.

Types of Check Valves

Piston check valves (also referred to as lift check valves), are unique in that the higher pressure of an upstream fluid can cause its disc (lift) to lift – allowing the fluid to flow to the downstream side. (There is a guide that monitors the valve, so that it can close accurately). Once the upstream high pressure is no longer present, either gravity or higher downstream pressure will bring the disc back down to close the valve, preventing a reverse flow.

Ball check valves consist of a ball that moves to either block or allow the fluid to flow through the valve. Sometimes a spring is attached to the ball to keep the valve sealed shut. For valves without a spring, reverse fluid flow is needed to move the ball in order to close the valve.

Stop check valves do exactly what they say – stop fluid flow. They are unique in that they can stop fluid flow regardless of the fluid direction or pressure and they have the ability to close the valve from an exterior switch – preventing any fluid flow.

Check Valve Configurations
Clapper valves
Diaphragm check valves
Double ball check valves
Double check valves
Dual plate check valves
Swing check valves

Check Valve Materials
All of our check valves, which are hydro tested and come with a one-year warranty, are listed below:

Cast steel construction
WCB
C-5
WC6
WC9
C-12
CB

Flanged-buttweld
Bolted bonnet
Pressure seal
Stainless steel construction
304
316
A20
Exotics
Flanged-buttweld
NPT
SW
Cast iron construction

Diameters from ½ to 36"
150 lb to 2,500 lb psi

we meet the check valve needs of suppliers to the petrochemical and oil and gas industries throughout the world with fast delivery of quality check valves at competitive prices. Our top priority is providing affordable, high-quality valves as quickly as possible.

Kata Valve (Group) Co.,Ltd. is headquartered at Baoshan City Industrial Zone,Shanghai China, occupying over 35 thousands square meters and will be looking at other expansions in the near future. The registration capital of the whole Group comes to RMB 100 Millions. Also it is one of high-tech enterprises in Shanghai, a member of the Association of China General Machinery, and a regular supplier to China Petroleum & Natural Gas Corp,China Petrochemical,China Power,and China Sea Oil etc.

With an experience of about 30 years in manufacturing all kinds of valves,Kata specializes in disigning, making and marketing valves for all industries. Its products range from Ball, Butterfly, Gate, Globe,Check,Plug valves to Marine valves and other valves;nominal size from 1/2" to 48" (DN15 to DN1200);nominal pressure from 150Lb to 2500Lb (PN1.0Mpa to PN42.0Mpa); materials cover WCB, WCC, WC6, WC9, CF8, CF3, CF8m, CF3M, LCB, LCC, A105, 304, 316, 304L, 316L, F11, F22, LF2, F51, etc. The products are widely used in the fields of petroleum, chemical, metallurgy, power, fuel gas, city pipeline networks and so on. Certificated with ISO9001, API6D, CE/ PED, Kaitai has developed excellent quality control and management system.

Kata has a series of modern machines and equipments such as vertical lathes, drill press, milling lathe, grinding machine , other general machine tools and physical & chemical analysis & experiment devices. Also it has developed a well-trained and dedicated team including engineers,technicians and other employees. This allows us to offer customers quality product,competitive pricing and prompt deliveries. We always work hard to improve our existing products and pursue new ideas and ways to stay ahead of the ever changing market.