Gate Valve | Check Valve | Globe Valve | Butterfly Valve | Ball Valve

Global hotline: 86-577-67927788 Email:sale@asia-valve.com 　　　　　 A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel. Typical gate valves should never be used for regulating flow, unless they are specifically designed for that purpose. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. Typical gate valves are designed to be fully opened or closed.[1] When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss[2]. gate valves are characterised as having either a rising or a nonrising stem. Rising stems provide a visual indication of valve position. Nonrising stems are used where vertical space is limited or underground. Bonnets provide leakproof closure for the valve body. gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications. Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The unique feature about the pressure seal bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint. gate valves normally have flanged ends which are drilled according to pipeline compatible flange dimensional standards. gate valves are typically constructed from cast iron, ductile iron, cast carbon steel, gun metal, stainless steel, alloy steels, and forged steels. Types of ball valve There are five general body styles of ball valves: single body, three piece body,split body, top entry, and welded. There are three general types of ball valves according to bore A full port ball valve has an over sized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted, but the valve is larger. This is not required for general industrial applications as all types of Valves used in industry like gate valves, Plug Valves, butterfly valves etc have restrictions across the flow and does not permit full flow. This leads to excessive costs for full bore ball valves and is genearlly a unneccessary spending for customers. In reduced port ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area becoming lesser than pipe. But the flow discharge remains constant as it is a Multipler factor of Flow discharge(Q) is equal to Area of Flow (A) into Velocity (V). A1V1=A2V2 i.e the Velocity increase with reduced Area of flow and Velocity decreases with increased area of flow. A V port ball valve has either a 'v' shaped ball or a 'v' shaped seat. This allows the orifice to be opened and closed in a more controlled manner with a closer to linear flow characteristic. When the valve is in the closed position and opening is commenced the small end of the 'v' is opened first allowing stable flow control during this stage. This type of design requires a generally more robust construction due to higher velocities of the fluids, which would quickly damage a standard valve. A trunnion ball valve has a mechanical means of anchoring the ball at the top and the bottom, this design is usually applied on larger and higher pressure valves (say, 4" and above 600 psi and above). Manually operated ball valves can be closed quickly and thus there is a danger of water hammer. Some ball valves are equipped with an actuator that may be pneumatically or motor (electric) operated. These valves can be used either for on/off or flow control. A pneumatic flow control valve is also equipped with a positioner which transforms the control signal into actuator position and valve opening accordingly. globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.[1] globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug[2] can be screwed in to close (or shut) the valve. The plug is also called a disc or disk.[3][4] In globe valves, the plug is connected to a stem which is operated by screw action in manual valves. Typically, automated valves use sliding stems. Automated globe valves have a smooth stem rather than threaded and are opened and closed by an actuator assembly. When a globe valve is manually operated, the stem is turned by a handwheel. Although globe valves in the past had the spherical bodies which gave them their name, many modern globe valves do not have much of a spherical shape. However, the term globe valve is still often used for valves that have such an internal mechanism. In plumbing, valves with such a mechanism are also often called stop valves since they don't have the global appearance, but the term stop valve may refer to valves which are used to stop flow even when they have other mechanisms or designs. globe valves are used for applications requiring throttling and frequent operation. For example, globe valves or valves with a similar mechanism may be used as sampling valves, which are normally shut except when liquid samples are being taken. Since the baffle restricts flow, they're not recommended where full, unobstructed flow is required. butterfly valve is a type of flow control device, typically used to regulate a fluid flowing through a section of pipe. The valve is similar in operation to a ball valve. A plate or disc is positioned in the center of the pipe. The disc has a rod passing through it that is connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position. Large butterfly valve used on a hydroelectric power station water inlet pipe in JapanA butterfly valve is from a family of valves called quarter-turn valves. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to regulate flow. (See throttle.) There are different kinds of butterfly valves, each adapted for different pressures and different usage. The resilient butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance butterfly valve, used in slightly higher-pressure systems, features a slight offset in the way the disc is positioned, which increases the valve's sealing ability and decreases its tendency to wear. The valve best suited for high-pressure systems is the tricentric butterfly valve, which makes use of a metal seat,[clarification needed] and is therefore able to withstand a greater amount of pressure. check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which 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, and/or cheap. 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 a pump. Gate Valve, Ball Valve, Check Valve, Butterfly Valve, Globe Valve , Plug Valve 　　ZHEJIANG SEDELON VALVE CO.,LTD.

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Sedelon Valve Co., Ltd. is a Chinese leading Valve Manufacturer, Supplier & Exporter. According to API,DIN,BS,JIS standards Production Gate Valve, Ball Valve, Check Valve, Butterfly Valve, Globe Valve , Plug Valve ,and specialized in researching and producing various non-standard valves. Having made great achievements,We will never stop our steps for improvements. Our personnel warmly welcome clients both at home and abroad to negotiate with us for business relationships.


API Cast Steel Gate Valve	Inverted Pressure Balance Lubricated Plug Valve ANSI	API Pressure Seal Gate Valve	Cast Steel Swing Check Valve	Butterfly Swing Check Valve


Flanged type three offset Butterfly valve	Cast Steel Fixed Ball Valve	Cast steel Floating Ball Valve	API Plate Gate Valve	API Cast Steel Globe Valve


DIN3352 Gate Valve	API Forged Steel Gate Valve	JIS Gate valve	Forged Steed Floating -Ball Valve	V type Ball valve

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Zhejiang Sedelon Valve Co., Ltd. is a Chinese leading Valve Manufacturer, Supplier & Exporter. According to API,DIN,BS,JIS standards Production Gate Valve, Ball Valve, Check Valve, Butterfly Valve, Globe Valve , Plug Valve ,and specialized in researching and producing various non-standard valves. Having made great achievements,We will never stop our steps for improvements. Our personnel warmly welcome clients both at home and abroad to negotiate with us for business relationships.

Zhejiang Sedelon valve Co.,Ltd
Tel:86-577-67927788
Tel:86-577-67926789
Fax:86-577-67927789
E-mail:sale@asia-valve.com
Homepage:http://www.asia-valve.com
Factory Address:Baoyi Industry Zone,Oubei, Wenzhou, Zhejiang, China
Zip code: 325105

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