Gate Valves

Your Premier Gate Valves Manufacturer

Zhejiang AODEHUA Technology Co., Ltd. is located in the beautiful and rich East China Sea - Yuhuan City. Founded in 2002, Aodehua Group specialized in the production of brass water plumbing valves for more than 20 years. Set development, forging, manufacturing, testing, and sales as one, superb technology, and stable and reliable quality make "AOHUA" products win the favor of consumers.

Various Types

Our products cover the entire heating and plumbing system, such as ball valves, gas valves, gate valves, manifolds, TRV, air vent valves, water radiators, magnetic filters, etc.

Quality Assurance

The entire production process is controlled by the ISO9001 product quality management system. The pass rate of the products is 100%.

Fast Delivery

Our company's monthly production capacity reaches 1 million sets, and we can achieve fast and on-time delivery.

24H Online Service

Our customer service representatives are available 24/7 to assist you with any inquiries, technical issues, or after-sales services.

What Is Gate Valves?

A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened. The gate faces can be parallel but are most commonly wedge-shaped (in order to be able to apply pressure on the sealing surface).

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Advantages of Using an Industrial Gate Valves

Fluid Resistance

Gate valves offer a very small fluid resistance. The minimal fluid resistance is due to the straight inner media channel of the body which allows the medium to flow directly through the valve without changing direction. As such, the flow’s path is unobstructed.

Energy-Efficiency

Gate valves are an energy-efficient valve option, as the movement direction or ram is perpendicular to the media flow direction. As a result, less power is consumed when opening or closing the gate valves in comparison to globe valves.

Simple Body

Gate valves are composed of a relatively simple body. Therefore, they are easier to operate compared to isolation valves with more complex designs.

Dual Flow Direction

Gate valves can be used in any direction in the circuit. In other words, their media flow is unobstructed for all directions of the valve body and they aren’t subject to the medium’s directional flow. This makes them ideal for use in pipelines where the flow direction may change depending on the medium.

Minimal Erosion

In comparison to other valve options, gate valves typically experience less erosion on their sealing surface when they are fully open. This minimal erosion is largely attributed to the valve’s tight seal functioning.

Minimum Pressure Loss

Due to the laminar flow that they provide, the pressure loss of gate valves is minimal. It’s always helpful when pressure loss can be mitigated.

Gate Valves: Everything You Need to Know!

Gate valves work by inserting a physical barrier (the gate or disk) into the pipeline, sealing it when closed, and lifting it out of the way when opened. This barrier is raised or lowered via a handwheel on the valve bonnet, which serves as the valve actuator. It turns clockwise and anticlockwise to start or stop the liquid flow as required.

Gate Valve Types

The gate comes in various designs and technologies to produce effective sealing for differing applications.

Knife Gate Valve

A knife gate valve is used for thick fluids and dry bulk solids. The gate is only one piece of metal, which is typically pointed like a knife. These valves are self-cleaning as they pass the seat rings every time they open and close.

Wedge Gate Valve

A wedge gate valve has a gate in the shape of a wedge that sits on two inclined seats. In addition to the primary force created by fluid pressure, a high wedging force on the seats created by the stem tightening assists with the sealing.

Parallel Slide Gate Valve

A parallel slide gate valve has a flat gate and seats parallel to it. Parallel slide gate valves use line pressure and positioning to make a tight seal. Due to their inherent design, parallel gate valves have a safety advantage in higher-temperature applications.

Slab Gate Valves

Slab gates, also called through-conduit gate valves, are one-unit gates that include a bore-size hole. The bore is in line with the two-seat rings in the open state. This alignment creates a smooth flow with minimal turbulence.

Parallel Expanding Gates

Expanding gate valves have two slab gates matched together that provide sealing through the mechanical expansion of the gate. When lifted, both of the slab gate's cavities allow the media to flow.

Application of Our Gate Valves

House Water System

Gate valves are often used in house water systems to control the flow of water on and off. The faucets and check valves we see at home are all composed of gate valves.

Fire Fighting System

Gate valves are also used in fire protection systems. When a fire occurs, firefighters can use gate valves to control the fire water flow.

Drainage System

In drainage systems, mobile gate valves can be used to control liquid level and water flow to ensure the normal operation of the drainage system.

Agricultural Irrigation

Gate valves are also important pipeline controllers in agricultural irrigation, which can adjust the water volume and frequency of farmland irrigation.

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Medical Hygiene

Gate valves can be used to regulate and cut off different media in hospitals, pharmaceutical factories and other medical and health fields to ensure a safe and hygienic production and use environment.

Industrial Manufacturing

Gate valves are also widely used in industrial manufacturing, such as in chemical equipment, sewage treatment, power plants and other fields. Gate valves can control the flow of industrial liquids and ensure the normal operation of the production process.

Installing Gate Valve Components

When installing a gate valve assembly, there are some important tips to follow to ensure the components are safe and functional. Some of these include:

1. Inspect components such as the gate, seat, and valve material to ensure there are no defects prior to installation.

2. Ensure that welding work is complete and the weld area contains no residue and other debris. Also, check that the flanges have cooled to ambient temperature before installation using the appropriate gaskets.

3. In addition, there should be no warpage or misalignment between the flange and gate valve. If the valve is large, there may be a need for some structural support to reduce the load on the pipe assembly.

4. Adjust the two flanges to allow for enough space to slip the valve in or out for service, then carefully install the spacing bolts. This should be done in a way that the bottom of the valve rests on the bolts to prevent the valve from falling through.

5. Tighten the bolts in stages so an even pressure and a proper seal exist between the flanges, valve, and gasket.

6. Finally, lubricate and operate the valve several times and check the stability of the assembly.

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FAQ

Q: How to tell if a gate valve is open or closed?

A: In rising stem gate valves, the stem position tells whether a gate valve is open (outside of the valve body) or closed. In non-rising stem gate valves, it is not easy to determine if the gate valve is fully open, closed, or somewhere in between at first sight. A marker of the closing direction (cc for clockwise closing, acc for anti-clockwise closing) can be helpful in determining the position of the wedge. A position indicator is a special device, which is mounted on the gate valve stem and helps a user quickly determine the position of the gate valve.

Q: What is the gate valve used for?

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 difference between a gate valve and a wedge valve?

A: Wedge valves have a conical or wedged-shaped disk, while gate valves have a flat disk. Wedge valves rely on a wedging action to seal, while gate valves rely on a linear motion. Wedge valves are well-suited for high-pressure applications, while gate valves are not. Wedge valves are more expensive than gate valves.

Q: What is a main gate valve?

A: Water main gate valve: Gate valves are the most common type of valve used for opening and closing water flow in a water main. Primarily, water main gate valves are used to isolate parts of the system for maintenance. Irrigation systems: Gate valves permit large volumes of water and are ideal for irrigation systems.

Q: What is the most commonly used gate valve?

A: Solid wedges
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 difference between a gate valve and a pressure valve?

A: Pressure: Both ball valves and gate valves are suitable for low pressure applications. However, for high pressure applications, a gate valve is better suited. This is due to the fast opening/closing of the ball valve that may cause a water hammer.

Q: Why is it called a gate valve?

A: A gate valve is the most common valve for water supply systems. It represents a linear-motion isolation valve and has a function to stop or allow the flow. Gate valves got their name from the closure element sliding into the flow stream to provide shutoff and, therefore, acting like a gate.

Q: Are gate valves full port?

A: By design, gate valves have full-port ports. This means that the valve port size equals the inner diameter of the connecting pipe. Full-bore gate valves allow fluid to flow freely without obstruction and without creating a pressure drop within the pipeline.

Q: What is the difference between parallel and wedge gate valves?

A: Parallel Gate Valves are used to control the flow pressure while Wedge Gate Valves are most commonly used and allow for fluids to be tightly shut off. Our gate valves are industry approved for a wide range of applications, from oil & gas to pulp & paper.

Q: Can a gate valve reduce pressure?

A: Since the gate incrementally opens and closes, water pressure is progressively reduced, avoiding these pressure waves. Like ball valves, gate valves should only be used to open or close the flow of fluids.

Q: When not to use a gate valve?

A: Gate valves are designed for fully open or fully closed service. They are not ideal for regulating flow because the flow of fluid can cause erosion and damage to the gate. However, they are well-suited for applications where a straight-line flow of fluid with minimum restriction is desired when the valve is fully open.

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: Is a gate valve a stop valve?

A: Gate valves are used to control the flow of liquids and gasses. They are often used in piping systems to regulate the flow of water or other fluids. On the other hand, stop valves are used to shut off the flow of liquids or gasses. They are often used in emergencies to shut off the flow of a substance quickly.

Q: Is a gate valve a check valve?

A: Both regulate fluid or gas flow, but differ in construction and function. In fluctuating or low flow systems, check valves prevent backflow and contamination. On the other hand, gate valves regulate high-pressure or large diameter pipe flows with precision.

Q: Should gate valve be fully open?

A: A rotary gate valve should be opened to the stop and then closed just a little. By leaving the valve just a bit closed, the stem packing is not compressed. This extends the life of the valve and makes it easier to operate when it needs to be closed fully. A quarter-turn ball valve can be left fully open.

Q: How are gate valves installed?

A: It is recommended that the gate valve is installed with the gate seal (carriage side) facing toward the chamber (vacuum side). Mounting the valve in this configuration will eliminate the pump down of the valve body. The gate valve may be mounted in either a vertical or horizontal position.

Q: What is a 3-way gate valve?

A: A 3-way control valve stops water flow in one pipe while allowing it to flow in another. The valve can also combine water from two distinct pipes into one pipe or redirect water from one pipe into two different pipes in a modulating or three-point floating application.

Q: Is the gate valve a throttle valve?

A: Gate valves are not intended for throttling. They are designed such that media flowing at high velocity can vibrate and quickly erode or tear a partially open valve disc off its seat. In a pinch, gate valves should only be used for throttling when the gate is 90% closed.

Q: Why choose 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: Which is the first check valve or gate valve?

A: The check valve must be installed before the outlet control valve at the pump's outlet so that it can be repaired. In general, the pump's first outlet is a soft connection (shock absorber), followed by a check valve, and finally a block valve (such as butterfly valve, gate valve, globe valve, etc.)

As one of the leading gate valves manufacturers and suppliers in China, we warmly welcome you to wholesale bulk discount gate valves from our factory. All customized products are with high quality and competitive price. For quotation and free sample, contact us now.

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