Author: Site Editor Publish Time: 2019-06-15 Origin: Site
The gate of the industrial gate valve moves linearly with the valve stem, which is called the rising stem gate valve. Usually, there is a trapezoidal thread on the lifting rod, and the rotary motion is changed into a linear motion by the nut at the top end of the valve and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust.
List of content for this article：
·Advantages of gate valve
·Disadvantages of gate valve
Advantages of the gate valve:
(1) The fluid resistance is small
Because the internal medium passage of the gate valve body is straight-through, and the medium does not change its flow direction when flowing through the gate valve, so the fluid resistance is small.
(2) The opening and closing torque are small, and the opening and closing is less labor-saving.
Because the direction of movement of the ram is perpendicular to the direction of flow of the medium when the gate valve is opened and closed, the opening and closing of the gate valve is less labor-saving than other industrial valves.
(3) The flow direction of the medium is not restricted, no disturbance, no pressure reduction.
The medium can flow through any direction on both sides of the gate valve and can achieve the purpose of use. It is more suitable for use in pipelines where the flow direction of the medium may change.
(4) The length of the structure is short
Because the gate of a gate valve is vertically placed in the valve body, and the valve flap of the shut-off valve is horizontally placed in the valve body, so the structure length is shorter than the shut-off valve.
(5) Good sealing performance
The sealing surface is less eroded when fully open.
(6) When fully open, the sealing surface is less affected by the working medium than the shut-off valve.
(7) The shape is relatively simple, the casting process is good, and the scope of application is wide.
Disadvantages of the gate valve:
(1) The sealing surface is easy to damage.
When the two plates are in contact with the valve seat during opening and closing, there is relative friction between them, which is easy to damage, which affects the seal and the service life. It is difficult to repair.
(2) Long opening and closing time, high height
Since the gate valve must be fully open or fully closed when opening and closing, the stem stroke is large, and the opening requires a certain space, the outer shape is high, and the space required for installation is large.
(3) Complex structure
Gate valves generally have two sealing faces, which add some processing, grinding, and maintenance. There are many difficult parts, making it difficult to manufacture and maintain, and the cost is higher than the industrial globe valve.