Gate valve for truncated or on-line media, use different materials, can be applicable to water, steam, oil products, nitric acid, acetic acid, oxidizing medium, urea and other media, used more often in the oil pipeline. Most of the hardware gate valve Dalian type necking design flow to be slightly smaller compared to the same caliber of cast steel gate valve, but to withstand the pressure and temperature range than cast steel valves, sealing performance is a lot better than the cast steel gate, longer life, as unrestricted media flow direction and the other gate valve.

Valve has the following advantages:

1 Fluid resistance is small, distressed brush and erosion of the sealing surface by the media.

2 Opening and closing more effort.

3 Medium flow unrestricted non-spoiler, not reduce the pressure.

4 The simple shape, the short length of the structure, and good manufacturing processes for a wide range.

Valve defects are as follows:

1 Between the sealing surface is easy to cause erosion and abrasion, maintenance more difficult.

2 Dimensions larger open requires a certain space, the opening and closing time.

3 Is a more complex structure.

Valve installation and maintenance should note the following:

1 Handwheel, handle and drive mechanism does not allow for lifting with non-collision.

2 Gate Valve should be mounted vertically (ie, stem in a vertical position, the hand wheel at the top).

3 Gate valve with bypass valve in the open before you open the bypass valve (opening force to balance imports and exports and reduce the pressure).

4 with the drive mechanism of the valve, according to the product instructions for the installation.

If the valve is turned on and off frequently use, at least monthly lubrication time