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Cryogenic Slab Gate Valve

Name: China Customized Cryogenic Slab Gate Valve - Cheap Cryogenic Slab Gate Valve Made in China - Advanced Technology Valve
Brand: Advanced
SKU: 229394621

The valve products produced by the company are widely used in petroleum, natural gas, chemical industry, polysilicon, coal chemical industry, power station, metallurgy, papermaking, medicine, military industry and other industries.

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Description

Your Professional Slab Gate Valve Suppliers in China

Zhejiang Advanced Technology Valve Co., Ltd. is a technology-based manufacturing enterprise, which integrates designing, manufacturing and marketing valves and owns one stop service. The company's leading products include flat gate valves with diversion holes, flat gate valves without diversion, expansion double gate flat gate valves, hard-sealed double gate flat gate valves, and special flat gate valves for alumina plants.

Advanced Equipment

The company has various precision machining and testing equipment, large-scale surface CNC grinders, sphere machining centers and other new technologies, as well as the first-class full-performance testing equipment in the country.

Wide Range of Applications

18 Month Warranty

We offers an 18-month warranty for each valve. Within these 18 months, if our products fail, leak, or even damage during use (excluding human factors), we will be responsible for replacing the products with quality problems and delivering them to your warehouse.

Excellent Pre-sales Service

Our pre-sales service includes the communication and confirmation of a series of transaction terms before you place an order, including price, product drawings, trade terms, delivery date, etc. In addition, in the process of order production, we will let you know the status of the product in the form of pictures and videos to confirm the production process.

Introduction of Slab Gate Valve

Slab gate valves, also named "through conduit gate valves," are manufactured and tested in accordance with the API-6d standard. This type of valve is very useful in gas, crude oil, and oil products transportation pipelines. The slab gate valve is through the conduit and is peggable. The slab gate valve has been designed to minimize pressure drop and catch foreign materials, such as slurries, into the disc cavity to keep the sealing surface areas clean.
Slab gate valve can be divided into a manual slab gate valve, a pneumatic slab gate valve, and an electric slab gate valve according to the operation. According to the use and use occasions, it can be divided into sluice gate valve with diversion hole, slab gate valve without diversion hole, oil plate slab gate valve, pipeline slab gate valve, and gas slab gate valve.

Our Related Products

Rising Stem Flat Gate Valve

It has the advantages of simple and compact structure, reasonable design, reliable sealing, light and flexible operation, small size, smooth channel, low resistance, easy installation and easy disassembly.

Dark Rod Flat Gate Valve

When the valve is fully opened, the flow resistance coefficient is very small, and the valve will eliminate the function of the valve disc and the dirt on the sealing surface every time the valve is opened and closed.

Insulation Flat Gate Valve

The packing is made of flexible graphite ring and graphite packing, reliable sealing, light and flexible operation.

Buried Slab Gate Valve

It can be installed in the ground, which can save the cost of digging and fixing the wall of the large-caliber ground well, and the surface exposure range is small, which will not affect the beautification of the road, saving investment and eliminating the safety problems caused by the loss of the ground well cover.

High Temperature Flat Gate Valve

When designing high temperature valves, special attention should be paid to the influence of thermal expansion, thermal alternations and mechanical properties of materials. Due to the difference in the coefficient of thermal expansion of the material, the thermal load of the parts, etc., even the expansion amount of the valve seat and the valve core heated almost at the same time are different at high temperature.

Normal Temperature Flat Gate Valve

Gate valve is a commonly used pipeline valve, and its working principle is to control the flow of the medium by lifting the gate plate. Gate valve has simple structure, good sealing performance and small flow resistance, and is widely used in various industrial fields.

Fire Slab Gate Valve

It is widely used in oil and water steam pipelines such as petrochemical industry and thermal power plants to connect or cut off the intermediate quality of pipelines.

Bellows Flat Gate Valve

The use of bellows as a sealing element can adapt to the temperature, pressure and corrosion of different media to ensure the sealing performance of the valve.

Adjustable Flat Gate Valve

Changed the traditional gate can only be fully open or trap, can not be adjusted and throttling, need to install another valve for adjustment and throttling, can not meet the needs of the use of pipelines.

Product Specification

Basic Design	API 6D
Face-to-Face Dimension	ANSI B16.10
Flange End Dimension	ANSI/ASME B16.5 (2" to 24") ANSI/ASME B16.47 & MSS SP-44 (26" & up)
Butt-Weld End Dimension	ANSI/ASME B16.25
Inspection & Testing	API 6D
Fire Safe Design	API 6FA
Size Range	2″-60″(50mm-1500mm)
Temperature Range	-60 to 500 degree
Pressure Ratings	Class 150 to Class 2500,PN 2.5 to PN420,10K-20K
Disc Materials	Carbon Steel,Stainless Steel,Nickel Aluminum Bronze,alloy steel,etc
Testing Standard	API 598,EN12266-1,ISO 5208
Seat Materials	Soft Seated
Body Materials	Carbon Steel,Stainless Steel,Nickel Aluminum Bronze,alloy steel,etc
Stem Material	Stainless Steel
Body Style	Double Flanged,Butt Weld,
Packing	To be packed in suitable wooden cases as per client's option or customized
Shipping & Delivery	20-25 days lead time; deliver by ship from Ningbo port or Shanghai port
Notes	Serial valve connecting flange and butt-welding terminal size can be designed at customers' request. The material of the main parts and sealing surface of the valve can be designed and selected according to the actual working conditions or the special requirements of users.

Main Features of Slab Gate Valve

01/

The valve seat is inlaid with soft sealing ring to make the sealing zero leakage. The sealing surface of valve seat and gate is overlaid with cemented carbide to improve the scouring resistance and prolong the service life of the valve.

02/

All valves have self cavity pressure relief function to ensure the safety of the pressure in the middle chamber.

03/

The valve meets NACE standard, fugitive emission function and fire test certification of API Spec 607.

04/

The valve seat can be designed with double piston or single piston with low operating torque.

05/

Locking devices standard on lever operated valves.

06/

API 622 certified live loading of packing and low leakage packing, make the stem seal safer.

Slab Gate Valve Design

Stem/Stem Seal
The stem is designed with a threaded-in T bar allowing relative motions of the gate under line pressure. The stem seal uses braided graphite gaskets ensure sealing integrity. Stem sealant injection system is achieved through a por t located on the bonnet. In case of leakage through the stem seal it is possible to inject the sealant through the stem packing release valve.

Seat
Seats are ENP coated and are provided with thermoplastic soft inser t on their face. A "double face seal" effect is obtained due to metallic contact between the seat and the gate, thus increasing the reliability of the valve. Metal-to-metal seating is available for abrasive ser vice. In such case gate and seat faces are coated with HVOF Tungsten Carbide coating.

Fire-safe Design
Through Conduit Slab Gate valve is available in the API 6FA fire-tested design. Fire-tests have been witnessed and cer tified by independent authorities. Fire tested gate valves offer the highest resistance against fire. The body seal is a spiral wound graphite/AISI 316 gasket and the stem seal is a die-formed/braided graphite packing. The stem incorporates the back seat feature to allow stem seal re-packing with valve in ser vice. Fire-tests cer tification is available and can be provided upon request.

Fully Piggable
Through Conduit Slab Gate Valves are designed to be Fully Piggable. Pigs and scrapers can be run through the valve without any damage to the internal structure of the valve.

Easy Maintenance
Through Conduit Slab Gate valve design minimizes and eases the maintenance allowing for the service operations to be done without the removal of the valve from the line.

Double Block and Bleed
Double block and bleed capability and automatic relief of excess body pressure are standard features of Through Conduit Slab Gate Valves. With the valve fully closed and pressure on both sides, it is possible to bleed the pressure from the body cavity to check seat seal integrity and to achieve double isolation between the two sides and avoid any risk of product contamination.

Single Piston Effect Seats
Seats rings are floating type and are energized against the gate by means of helical springs. The initial seating is enough to assure sealing between gate and upstream seat when the line pressure is applied. The gate allows axial movement and the upstream force derived from line pressure force the gate against the downstream seat creating a double, bubble tight barrier.

Applications of Slab Gate Valve

● Gas Industry Service
● Gas Production, Offshore
● Oil Production
● Oil Transportation
● Petrochemical Processing
● Petroleum Distribution
● Petroleum Production and Refining

How to Operate Slab Gate Valves

The through conduit gate valve is designed and manufactured with a rising spindle for the floating motion of the valve. During operation, the pipe fluid fills the bore cavity. The fluid pressure in the bore cavity generates a vertical force on the stem that pushes the trim from bottom to top. In an emergency, this force is used to help the actuator spring to bring the valve door into the required failure mode position.

Standard Operating
The standard operating design means that the valve is closed with the valve stem down and is common for a fail open configuration because the "stem ejection force" helps the actuator spring to open the valve.

Reverse Operating
The reverse operating design means that the valve is closed with the valve stem up and is common for a fail close configuration, because the "stem ejection force" helps the actuator spring to close the valve.

Seat Sealing
Slab valve construction includes spring-loaded floating seats that provide positive seating on both sides regardless of upstream or downstream pressure conditions. The seat seals are spring loaded to ensure sealing under low pressure. As line pressure increases, the contact pressure between the seat and port increases accordingly for a positive seal. Since both seats are separately energized by the pressure differential across the seat itself, the valve cavity can be vented when the upstream and/or downstream side is pressurized. The valve exhibits identical performance regardless of flow direction and/or direction of pressure differential. Several solutions are available for seat-to-body gaskets, depending on the type of operating fluid, pressure and temperature.

Our Certificates

We guarantee that all our products have passed the quality control and stringent regulations imposed not only by our company but also by international organizations. Our certifications assure that our product line is top grade by industry standards.

Common Problem of Slab Gate Valve

Q: What is through conduit slab gate valve?

A: The slab gate valve is the oil and gas industry's choice for liquid and gas applications requiring reliable, tight shut-off to prevent leakage and minimize losses from process contamination. It is ideal for pipeline applications requiring pigging capability. Its full-bore design features spring-energized seats and a floating slab gate to ensure both low- and high-pressure sealing capabilities.

Q: What is the difference between a gate valve and a slab gate valve?

A: Expanding gate valves include two units-a gate and segment-in contrast with slab gate valves, which have one unit. The gate and segment units collapse against each other for travel and separate when the valve is fully opened or fully closed to affect a mechanical seal.

Q: What are the 2 types of gate valves?

A: Gate valves can be divided into two main types: Parallel and wedge-shaped. The parallel gate valves use a flat gate between two parallel seats, and a popular type is the knife gate valve designed with a sharp edge on the bottom of the gate.

Q: What is slab gate?

A: Slab Gate Valves also named "Through Conduit Gate Valves" are very useful in transportation pipe lines for gas, crude oil and oil products. The through conduit gate valve is designed and manufactured with a rising spindle for the floating motion of the valve. During operation, the pipe fluid fills the bore cavity.

Q: What is the purpose of a gate valve?

A: A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Thus it is used either in the fully closed or fully open positions. A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.

Q: When not to use a gate valve?

A: Because of this, gate valves may not be the best choice for applications that require frequent operation or fast cycle times. Gate valves are most commonly controlled by a manual handwheel, but electric and pneumatic actuation options are also available.

Q: What is the main disadvantage of the gate valve?

A: Assembly, start-up, and maintenance require large space. In the fully closed position, the slow movement of the slide causes high flow speed. Due to vibration and collision, abrasion and deformation occur in the seating surfaces and the surface gets damaged from friction.

Q: What is the most common used gate valve?

A: Solid wedges are the most common because of their simplicity and strength. They can be installed in any position, are suitable for almost all fluids, and are practical for turbulent flow. Flexible wedge gate valves are commonly used in steam systems.

Q: What is the alternative to a gate valve?

A: Compared to the gate valve, the butterfly valve-due to its specific construction-provides a much faster opening/closing action. The butterfly valve uses a fixed disc on a metal rod, which requires 90 degrees of rotation between the fully open and fully closed position.

Q: How does a gate valve seal?

A: Gate valves are a simple valve that, unlike most other types of valves, do not depend on rubber gaskets to make a seal. Instead, they use guides and a "gate" made of metal to stop and start flow. The multi-turn handle makes operation simple and smooth.

Q: What is the difference between slab gate and expanding gate?

A: One of the biggest differences between an expanding gate valve and a non-expanding valve is that an expanding gate valve has reduced or even zero friction on seats while cycling. A non-expanding gate valve, such as a slab gate or a wedge gate, has friction on the sealing surfaces.

Q: Should gate valve be fully open?

A: Gate valves are one of the most common valves used as a main shut off valve. They are reliable and long-lasting. Gate valves have a twist-type handle and should only be used to fully open water supply or completely shut off water supply. Using these valves to regulate the flow of water can wear them out.

Q: What are the problems with gate valve?

A: The most common causes of gate valve failure are wear and the seat's and wedge's corrosion. The inner areas of a valve wear off over time, and corrosion can make the wedge stick in the open or closed position. When the handwheel is overused, the stem leading to the wedge breaks off and renders the valve useless.

Q: How much pressure can a gate valve handle?

A: The main purpose of gate valve is to shut off the flow of fluids in a system. The valve is designed to be in either a fully opened or fully closed position. It is suitable to apply in low pressure application and the pressure rating can be up to 150 PSI working pressure.

Q: Does a gate valve reduce pressure?

A: Gate valves are equipped with a wedge-shaped metal gate that can be lowered to halt water flow and raised to allow flow to continue. When the gate is fully drawn up into the valve, it retracts entirely, allowing the water to flow through without any reduction in pressure.

Q: What is the advantage of using a gate valve?

A: Gate valves have dual flow directions. They're not limited to one-way flow, nor are they subject to the flow directions of the medium. Therefore, gate valves are suitable for use in pipelines where the flow direction may change. Plus, they are easier to install than other more sophisticated types of valves.

Q: Why do gate valves fail?

A: Gate valves can become stuck in the open or closed position due to rust, debris, or lack of lubrication. When a valve is stuck, it cannot perform its intended function.

Q: Why does my gate valve spin but not open?

A: A gate valve has a stem, and if the stem turns and turns for you while not exerting any control over the water flow either way, there's a good chance that the stem is broken off at the gate or the threads on the stem have been stripped to the point that they no longer operate the way they're supposed to.

Q: What materials are used in gate valves?

A: Gate valves are typically constructed from cast iron, cast carbon steel, ductile iron, gunmetal, stainless steel, alloy steels, and forged steels. All-metal gate valves are used in ultra-high vacuum chambers to isolate regions of the chamber.

Q: What materials are used in gate valve seats?

A: The seats can also be metal-to-metal with Stellite or TCC coating. To facilitate assembly and on-line maintenance, the design usually includes "wings". Sizes range from 1/2" to 72" and materials can vary from carbon steel to nickel alloys.

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