Gate valves and seals
Jun 25, 2022
The mobile phones we use also use sealing gaskets. Without the sealing gaskets, a lot of dust will run into the inside of your mobile phone. So little seals are up in our lives
pivotal role.
Today, We mainly briefly explains the sealing topics related to valves and gates!
The gate valve is an opening and closing gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed. It is not suitable for different parameters, usually
5°, and 2°52' when the medium temperature is not high. To improve its manufacture ability and make up for the deviation of the sealing surface angle during processing, this gate is called an elastic gate.
The opening and closing part of gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two seals
The two sealing surfaces of the most commonly used mode gate valve form a wedge, and the wedge angle varies with the valve parameters, usually 50, and 2° 52' when the medium temperature is not high. Wedge gate valve gate
It can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its performance and make up for the deviation of the sealing surface angle during processing.
Poor, this kind of gate is called elastic gate. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate plate is pressed against the valve seat on the other side by the medium pressure.
To ensure the sealing of the sealing surface, this is self-sealing.
Most gate valves are forced to seal, that is, when the valve is closed, the gate plate must be forced to the valve seat by external force to ensure the tightness of the sealing surface. The gate of the gate valve follows the valve stem
It is called a lifting rod gate valve or a rising rod gate valve (gate valve seal) that acts in a linear motion. Usually there is a trapezoidal thread on the lift rod, through the nut at the top of the valve and the guide on the valve body
The groove changes the rotary motion into linear motion, that is, the operating torque becomes the operating thrust. When the valve is opened], when the lift height of the gate is equal to 1: 1 times the diameter of the valve, the fluid
The channel is completely clear, but at runtime, this position cannot be monitored. In actual use, the apex of the valve stem is used as a sign, that is, the position that cannot be opened is used as its fully open position.
set. In order to take into account the lock-up phenomenon caused by temperature changes, it is usually opened to the top position, and then back to 1/2-1 turn, as the fully open valve] position. Therefore, in the fully open position of the valve, press the gate.
The position of the plate is determined by the stroke. For some gate valves, the stem nut is set on the gate, and the rotation of the hand-wheel drives the valve stem to rotate, which makes the gate lift. This kind of valve is called a rotary stem gate valve or a
Dark stem gate valve.
