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Hydraulic Flat Gate Valve

Name: China Customized Hydraulic Flat Gate Valve - Cheap Hydraulic Flat Gate Valve Made in China - Advanced Technology Valve
Brand: Advanced
SKU: 229391577

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.

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Description

Your Professional Hydraulic 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

Wide Range of Applications

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.

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 Hydraulic Gate Valve

Hydraulic gate valve is a commonly used control valve. It is based on the principle of hydraulic pressure, through the hydraulic drive to control the flow and pressure of fluid.It is mainly composed of valve body, valve seat, gate, sealing device, hydraulic actuator and so on. The working principle of the hydraulic gate valve is to control the opening degree of the gate through hydraulic pressure, thereby controlling the flow of fluid. When hydraulic pressure is transmitted to the hydraulic actuator, it drives the gate plate to move upward or downward, thereby changing the opening degree of the valve. When the gate is completely closed, the valve is in a closed state; when the gate is fully open, the valve is in a fully open state; when the gate is in the middle position, the valve is in an adjustment state, and the opening degree of the gate can be controlled by changing the hydraulic pressure, thereby regulating the flow of fluid.

Our Related Products

External Thread Slab 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.

Flanged Slab 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.

Ferrule Flat Gate Valve

The card sleeve adopts standard design, which is very convenient to disassemble and install, and can reduce the installation deviation when it needs to be re-installed after disassembly, making maintenance more convenient.

Clamp Plate Gate Valve

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

Lug Plate Gate Valve

The gate adopts austenitic stainless steel, the corrosion resistance is greatly improved, and the sealing leakage caused by the corrosion of the gate can be effectively prevented.

Wafer Flat Gate Valve

The ram has the function of the knife, which can effectively break all kinds of debris in the medium.

National Standard Flat 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. The sealing surface of the opening and closing device has compact structure and reasonable design.

ISO Slab Gate Valve

German Standard Flat Gate Valve

Water seal gate valve is widely used in chemical, thermal, power plants and other oil, water vapor pipeline to connect or cut off the pipeline intermediate opening and closing device.

Product Specification

Size	2"~60"(DN50~DN1500)
Rating	ASME CLASS 150~2500(PN16~PN420)
Design Std	API6D JB/T5298
Body material	Carbon steel, stainless steel, alloy steel, dual-phase steel Connection: RF, BW, RTJ
Operation	Manual, pneumatic, electric and hydraulic
Usage	Flow control
Application	Industrial Usage
Face to Face	ANSI B16.10
Pressure-Temp	ANSI B16.34
End Connection	Flanged RF Ends, RTJ Ends, Threaded Ends, Union Ends, Welded Ends
Seat Material	PTFE, RPTFE, PEEK, Stainless Steel, Stellite, other material optional
Gate Material	Carbon Steel, Stainless Steel, Duplex, Hastelloy, Inconel, Monel, Alloy20, Incoloy, other materials optional
Working Temperature	-196℃~600℃
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 Hydraulic Gate Valve

● The integral forging of the valve body, along with the use of carbide alloy on the sealing surface and seats, enhances wear resistance, and corrosion resistance, and extends the service life of the valve.
● The metal-to-metal sealing between the gate and seat, seat and body, bonnet seal, and stem backseat provides a secure, long-lasting seal.
● The balancing lower stem of the valve allows it to stay in position even in the absence of hydraulic power, and the double- acting actuator requires hydraulic power to both open and close. Should a failure of hydraulic power occur, this valve will remain in position.
● Balancing stem that allows the gate to stay in position unless hydraulic power is supplied to the actuator to positively open or close valve.
● Two spring-loaded, pressure-energized, non elastomeric lip seals provide low-pressure sealing and protect against particle intrusion, while the stem seal design is capable of handling a wide range of pressures, temperatures, and fluids.
● Stem seal design that covers a wide range of pressures, temperatures, and fluids encountered in wellhead and manifolds service metal-to-metal bonnet seal.
● A manual locking screw maintains the gate in the closed position without any operating pressure, and socket head cap screws are used to tie down the actuator head flanges, reducing exposure to corrosive environments.

Hydraulic Gate Valve Installation & Maintenance Instructions

Storage Conditions
To protect the seat and seals do not unpack the valves until they are ready for installation. By doing this you are protecting the valve from dust and debris which may eventually cause seat leakage.
Keep in a cool well ventilated space if storing for a longer period of time.

Valve Installation
Valves can be installed in any orientation however it is best if it can be installed upright especially in bigger sizes for ease of hand wheel access.
Verify the material of the gate valve, seat and disc before installation. Ensure that there are no defects caused by storage or transportation.
Complete all welding works before valve installation and be sure the flange has cooled to ambient temperature before installing the gate valve using the appropriate gasket.
Make sure there is no welding residue, waste, rust, pickle paste or other debris in the pipe before installation. Wash with water or a mild detergent if needed.
Make sure there is no warpage of the flange or misalignment of the gate valve in relation to the flange. This is the most common cause of valve problems where it is not aligned with the flange/pipe correctly. Support the valve where necessary to reduce load on the piping assembly.
Install the spacing bolts taking care not to damage the valve seat and adjust the face to face of the two flanges so there is space when the piping is spread open (enough space to slip the valve in or out for service).
Once the pipes are centered, insert the bolts so that the bottom of the valve can rest upon them to prevent the valve from falling through.
Tighten the bolts one at a time doing it in stages so even pressure is applied and a seal is formed between the valve, gasket and flanges.
Once the installation is complete, operate the valve several times to ensure it has not moved during installation.

Field Testing
Rubber seated gate valves are designed to hold rated pressures only. Test pressures above rated working pressure in the closed position can cause damage to the valve.
With the valve in the open position the pipeline can be tested up to the valve hydrostatic test pressure.
Seat leakage can occur when foreign material is wedged between the seat and the body. If this occurs, open the valve 10% to 15% to obtain high velocity flushing action. Close and repeat if necessary.

Maintenance
Cycle the valve at least once a month if not used regularly.
Relieve the system pressure before performing any maintenance.
To remove from pipework reverse the installation sequence.
Replace valve gate by removing the top body (bonnet) and stem. Screw out the gate and replace with new part. Install top of body and refit into line.
See video link under each gate valve model for further instructions.

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 Hydraulic Gate Valve

Q: How do gate valves work?

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. The valve operates with a wedge or disc in the middle and it prevents flow of the fluid process to flow through the valve body. The wedge or a disc lifting up and down by rotating the wheel handle according to label "open" and "close" on the handle. A gate valve is a multi-turn valve meaning that the valve operation can be done by threaded stem. The valve has to turn multiple times from open to close position, so that the slow operation prevents water hammer effects. The gate moves up or downwards on the threaded stem part when operating the valve stem. Gate valve can be applied in all fluid services such as fuel gas, air, feed water, steam, hydrocarbon and lube oil.

Q: What is a gate valve used for?

A: A gate valve is the most commonly used for process plant application as it is a linear motion valve used to control the fluid flow. The valve can be either in fully opened or fully close position. The gate valve disc is completely removed from the flow when the gate valve is at fully opened position. A typical gate valve has no blocking in the flow path. Thus, resulting in a very low pressure loss and a free bore is created. When the valve is fully closed, a 360° surface contact is required between the disc and seats in order to perform proper sealing.
It is not applicable as control or regulating valves due to the accuracy of flow control is not achievable. The high velocity of the flow in the partially opened valve is not encouraged. It may cause erosion to the seating surface and disc which will next lead to vibration and noise.

Q: What is hydraulic gate valve used for?

A: Hydraulic gate valve is suitable for various liquid media, such as water, oil, gas, etc., and can withstand high working pressure and temperature. It is widely used in petroleum, chemical industry, metallurgy, electric power, water treatment and other fields. Hydraulic gate valve has the characteristics of simple structure, high reliability and easy maintenance, and can adapt to the flow adjustment and cut-off control needs under various working conditions.

Q: What are the features of hydraulic gate valve?

A: In general, the hydraulic gate valve also has the feature of remote control. By connecting with the control system, remote control and automated control can be achieved, improving production efficiency and safety. At the same time, hydraulic gate valves can also be equipped with various accessories, such as manual devices, electric devices, pneumatic devices, etc., to meet the requirements of different application scenarios. In general, the hydraulic gate valve is a control valve with comprehensive functions, high reliability and wide adaptability. It plays an important role in various industrial fields and can meet the flow control and cut-off control needs of different media.

Q: Which are better: gate valves or ball valves?

A: Here is an outline of the strong points, and differences between, these two types of valve:
● When fully open, gate valves and ball valves both have scarce pressure loss and, as such, an optimal hydraulic yield;
● Ball valves cannot be used to regulate the flow, while gate valves can, even when at the intermediate position;
● Ball valves are easy to move: Just turn the handwheel 90° to open or close the valve. This fast movement, however, favours hydraulic shock;
● Gate valves are slow to open and close, and this is why they tend to avoid overpressure waves;
● To avoid clogging, ball valves should be used with clean water and fluids that do not contain suspended particles;
● Gate valves can be used with denser, more dirty liquids, for example wastewater and sludge.

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 a slab gate valve used for?

A: This type of valve is very useful in transportation pipe lines for gas, crude oil and oil products. The Slab Gate Valve is through conduit and piggable. Slab Gate Valve has been designed to minimize pressure drop and catch foreign materials such as slurries into the disc cavity to keep clean the sealing surface areas.

Q: What are the components of a gate valve?

A: A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve. The seat and the gate together perform the function of shutting off the flow of fluid.

Q: What is the difference between expanding gate valve and 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 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 are the three common types of gate valve designs?

A: There are three types of discs used in gate valves: Flexible wedges, split wedges, and solid wedges. Like the stem, each disc has a specific use case. Wedges allow the application of greater pressure, which is why the wedge shape is common. Solid wedges are the most common.

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 difference between a gate valve and a wedge gate valve?

A: A wedge valve has a lower flow rate than its gate valve counterpart due to the sealing wedge being held in place between two slanted seats. Standard gate valves are linear, quarter-turn devices that regulate liquid flow. When opened, they completely block off the fluid path.

Q: Which is better ball valve or gate valve?

A: Flow Capacity: A gate valve can provide larger flow capacity than a ball valve as they are typically offered in larger diameters. Opening and closing speed: A ball valve is better suited for applications that require faster opening and closing speed or during emergencies due to its quarter turn on/off operation.

Q: What are advantages of flat gate valve?

A: The flow resistance is small, and the flow resistance without shrinkage is similar to the flow resistance of a short tube. The flat gate valve with pilot hole is installed on the pipeline and can also be cleaned directly with a vacuum cleaner. Since the gate makes the two valve seat surfaces change, the flat gate valve can also be applied to the medium with suspended particles. The sealing surface of the flat gate valve is actually automatically positioned, and the sealing surface of the valve seat is not damaged by the thermal deformation of the valve body. In addition, thermal elongation of the valve stem does not overload the sealing surfaces, even if the valve is closed in a cold state. In addition, when the valve is closed, the flat gate valve without the pilot hole does not require high precision in the flapper closing position, so the opening and closing position can be controlled by the electric flat valve stroke.

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: 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: 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 a knife gate valve?

A: A knife gate valve is a specific design of a valve that uses a knife edge that can enter the flow stream and, if necessary, use the edge of the gate to separate any materials that might prevent the valve from sealing completely.

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