What Are The Most Common Gate Valves?
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The most common types of gate valves include the following, which are widely used in various industrial and civil scenarios due to their different structural characteristics, sealing methods, or driving methods.
1. Wedge gate valve
Features: The gate and the valve seat sealing surface are wedge-shaped, with self-locking function and good sealing performance.
Classification:
Single-gate wedge gate valve: simple structure, but high requirements for the sealing surface angle accuracy; easy to cause wedging when the temperature changes.
Double gate wedge gate valve: complex structure, low requirements for the sealing surface angle accuracy, temperature changes are not easy to cause wedging, and gaskets can be added for compensation when the sealing surface is worn.
Elastic gate wedge gate valve: There are elastic grooves around the gate, which can produce slight deformation to compensate for the angle deviation of the sealing surface. It is suitable for various temperature and pressure occasions.
Applicable scenarios: high pressure, high temperature, and large-diameter pipeline systems.
2. Parallel gate valve
Features: The gate is parallel to the valve seat sealing surface, simple structure, and easy processing.
Classification:
Single-gate parallel gate valve: suitable for low-pressure and large-diameter occasions.
Double-disc parallel gate valve: with spring or wedge, suitable for low-pressure and small-diameter pipelines.
Applicable scenarios: medium- and low-pressure and large- and medium-diameter pipeline systems, such as water supply and drainage, heating, etc.
3. Rising stem gate valve
Features: The valve stem nut is on the valve cover or bracket. The valve stem moves up and down when opening and closing. When opening, the valve stem extends from the top of the handwheel, which can directly display the opening degree of the gate valve.
Advantages: The opening and closing degree is obvious, which is convenient for observation and maintenance.
Disadvantages: The thread is exposed, easy to adhere to dust, accelerates wear, and is suitable for installation in indoor environments.
Applicable scenarios: occasions where the valve opening needs to be intuitively displayed, such as industrial pipeline systems.
4. Concealing stem gate valve
Features: The valve stem nut is in the valve body. When opening and closing, the valve stem only rotates and does not rise.
Advantages: The required installation space is small, suitable for large-channel gate valves or occasions with limited installation space.
Disadvantages: The degree of opening cannot be directly displayed by the extension length of the valve stem, and an opening indicator needs to be installed; the valve stem thread cannot be lubricated and is directly corroded by the medium, which is easy to damage.
Applicable scenarios: occasions with limited space or requirements for installation height.
5. Soft-sealed gate valve
Features: The sealing surface is made of soft materials such as rubber and polytetrafluoroethylene.
Advantages: Good sealing performance, suitable for normal temperature, low pressure, and corrosive media.
Applicable scenarios: Pipeline systems in water supply and drainage, the chemical industry, the food industry, and other industries.
6. Hard-sealed gate valve
Features: The sealing surface is made of hard materials such as metal.
Advantages: High temperature and high pressure resistance.
Disadvantages: The sealing performance is slightly inferior to the soft-sealed gate valve.
Applicable scenarios: Pipeline systems with high temperature, high pressure, and high wear resistance requirements.
7. Manual gate valve
Features: The gate valve is opened and closed by manually rotating the handle or handwheel.
Advantages: Simple structure and easy operation.
Disadvantages: Not suitable for remote operation or automatic control.
Applicable scenarios: small pipeline systems or occasions where manual operation is required on site.
8. Electric gate valve
Features: The gate valve is driven to open and close by an electric motor.
Advantages: It can be remotely controlled and is suitable for automated control systems.
Applicable scenarios: pipeline systems that require remote control or automated operation.
9. Pneumatic gate valve
Features: The gate valve is driven to open and close by a pneumatic device (such as a cylinder).
Applicable scenarios: occasions where rapid response or explosion-proof requirements are required.
10. Knife-type gate valve
Features: The gate is blade-shaped and is suitable for pipelines containing particles, fibers, or viscous media.
Advantages: It can cut off the medium and prevent blockage.
Applicable scenarios: sewage treatment, papermaking, the chemical industry, and other industries.
