What are the American standard gate valve standards?

Gate is the opening and closing part of gate valve. Because the moving direction of the gate is perpendicular to the fluid direction, the gate valve can only be fully opened and closed, while the American standard gate valve is simple in shape, short in structural length, good in manufacturing process and wide in application range. Today we will take a look at the American standard gate valve standard. And the classification of gate valves.

American standard gate valve standard

A, all American standard flange gate valve * * * has characteristics:

1. The valve seat of American standard flange gate valve can be a more inclined valve seat, which can be combined and matched with the material of sealing surface at will to meet the working conditions and prolong the service life;

2. The closing part (gate) adopts elastic structure, which can automatically compensate the valve body deformation caused by abnormal load or temperature during work. Therefore, the seal is reliable, and the ram wedge column will not be generated;

3. The product design and manufacture meet the requirements of American national standard ANSIB 16.34, api gravity standard AP 16D and API600;

4. Compact structure, small volume, good rigidity and safe and reliable sealing;

5. The nominal diameter is greater than or equal to NPS101,the pressure grade is 400, the nominal diameter is greater than or equal to NPSS6 1 1, and the pressure grade is 150 ~ 2500. Its operating device is equipped with rolling bearings, which can be opened and closed.

6. The materials of the main body, internals, packing, gasket and fastener of American standard flange gate valve can be reasonably combined according to the user's requirements or actual working conditions.

Second, some American standard flange gate valve design standards:

Design and manufacture: API600 API6D GB 12234

Flange size: ANSIB? 16.5 JB/T79 GB 9 1 13

Pressure and temperature: ANSSIB? 16.34

Structural length: ansib16.10gb12221.

Size of butt welding connection: ANSIB? 16.25

Inspection and test: API598 JB/T9092

Gate valve classification

According to the configuration of sealing surface, it can be divided into wedge gate valve and parallel gate valve, and wedge gate valve can be divided into single gate, double gate and elastic gate. Parallel gate valves can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: open stem gate valve and hidden stem gate valve.

The installation and maintenance of gate valves should pay attention to the following matters:

Handwheel, handle and transmission mechanism are not allowed to be lifted, and collision is strictly prohibited.

Double-gate gate valves shall be installed vertically (i.e. the valve stem is in the vertical position and the handwheel is at the top).

The gate valve with bypass valve should open the bypass valve before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).

The gate valve with transmission mechanism shall be installed as specified in the product manual.

Does the valve open and close frequently? ,? Lubricate at least once a month.

Through the introduction of Bian Xiao above, I believe you have a general understanding of American standard gate valve standards. I would like to remind you that there has been such a phenomenon for a long time, that is, the gate valves sold in the market will leak or rust, so you should choose brands with quality assurance when purchasing, don't be greedy and cheap, and you can use them with confidence. I hope the above content will be helpful to everyone.

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