Gate Valve is the most widely used one among all types of valves. Gate Valve, whose disc or wedge moves vertically along the axis of the channel, has the same basic function of other valves, turning on or turning off channels. In the pipeline, it is used as a piece to connect and cut off the media inside. What is worthy to be noted is that an ordinary gate valve usually opens or close pipeline completely. In other words, it can’t be used as a controlling device to restrain the volume of the flow.

Gate valve can is designed to handle a wide range of situations: high temperature and high pressure or low temperature and low pressure. It also has the ability to deal with a handful of different media except those that are vicious, easy to precipitate or with granules.

Gate Valve has the following advantages:

1. small fluid resistance, safe and reliable;

2. small torque when turning it on or off;

3. it can be used in circular network pipelines where the medium flows in both directions. Namely, the flow direction of the medium is not restricted;

4. when it is fully open, gate vale’s sealing surface is less eroded than globe valve;

5. with a simple shape, it’s easy to cast and machining;

6. small face to face dimension.

Gate valves are widely used thanks to their many advantages mentioned above. Generally, the gate valve serves as the first choice to pick a cutting device for pipelines with DN≥50mm. And certain gate valves are still can be found even in some small size pipelines (such as DNV15 ~ 40mm).

Gate Valve also has its disadvantages:

1. relatively bigger space is required to install gate valves for their large size.

2. when open and close, abrasion occurs due to the relative friction between sealing surfaces;

3. gate valve’s two sea faces add difficulties to machining, grinding and maintenance.

4. long opening and closing time.

Gate Valves vary in structures. Generally, they differ from each other according to their seal components. Therefore, gate valves are usually divided into two types: parallel type and wedge type. What’s more, according to the structure of the stem, they also divided into rising stem and non-rising stem.

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