Gate valves are available with a variety of disks. Classification of gate valves is usually made by the type disk used:Wedge type single gate valve,Resilient gate valve,Double gate type gate valve, or Parallel gate valve.

1）Wedge type single gate valve

①Simpler structure than resilient gate valve.

(ii) At higher temperatures, the sealing performance is not as good as that of resilient gate valves or double gate valves.

(3) Suitable for high temperature media that are prone to coking.

(2) Resilient gate valve

It is a special form of wedge type single gate. Compared with the wedge type gate valve, at high temperature, the sealing performance is good, and the gate is not easy to be stuck after the heat; suitable for steam, high temperature oil and oil and gas and other media, and for frequent switching parts. It is not suitable for the medium which is easy to coke.

(3) Double gate type gate valve

①sealing performance is better than wedge gate valve, such as the sealing surface of the slant angle and seat with not very accurate, still has a good sealing.

②gate sealing surface wear, the metal pad at the bottom of the top of the sphere can be used for thicker, generally do not have to weld and grind the sealing surface, this single gate, resilient gate is difficult to do.

③parts more than other forms of gate valve.

(4) In addition to the steam, oil and other media, but also for the frequent switch parts and the seal surface wear and tear of the media, should not be used for easy coking media.

(4) Parallel gate valve

①sealing poorer than other forms of gate valves.

②Suitable for media with lower temperature and pressure.

(3) in addition to the gate plate equipped with a fixed plate on the two gate plate is not easy to fall off, where the use of lead wire fixed two gate plate is easy to fall off, the use of unreliable.

④The processing and maintenance of the sealing surface of the gate and the valve seat are simpler than other forms of gate valves.

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