Gate valves are divided into solid wedge gate valve, flexible wedge gate valve, rising and non-rising gate valve.
The closure is wedge, the wedge direction of motion is perpendicular to the direction of the fluid,
Gate valve only only be open and close fully, can’t adjust and throttle. The wedge has 2 sealing, most commonly used 2 sealing surfaces form a wedge, and the wedge angle varies with the valve parameters. The solid wedge can be make into a whole, this is solid wedge gate valve;
It can also be made into wedge that have small amounts of deformation, to improve manufacturability, make up for the deviation of the sealing surface angle during processing, this is flexible wedge gate valve.
When close, the sealing surface can be sealed only by the medium pressure, the sealing surface of the gate is pressed to the seat on the other side by the medium pressure to ensure the sealing surface, this is PSB.
Most of the gate valve is sealed using force, that the valve is closed, forced to rely on external ram pressure to the valve seat to ensure the sealing surface of the seal. The wedge and stem move together in a straight line, this is rising gate valve.
There are usually trapezoidal threads on the lifting stem, through the nut at the top of the valve and the guide groove on the body, become rotary motions into rectilinear motion, that become operation torque into the operation thrust.
When open the valve, the gate lifting height is equal to 1:1 times the valve diameter, the fluid passage is clear completely), but at run time, this location can’t be monitored.
In actual use, it’s marked by the vertex of the stem, the position that can’t open, as full open position.
Locking occurs to account for temperature changes, usually open at the vertex, go back 1/2-1 circle, as full open position.
Therefore, full open position of valve, according to the position of the wedge, that is, the stroke to determine.
Some gate valve, stem nut in wedge, handwheel rotation drives the stem rotation, make the stem lift, this is rotary gate valve or non-rising gate valve.
Valve Overview
A globe valve is a valve whose closing part moves linearly along the center line of the valve seat. Since the valve stem has a relatively short opening or closing stroke and has a very reliable shutoff function, and since the change in the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating flow. It can be used for shutoff or regulation and throttling in fluid pipelines such as tap water, sewage, construction, food, electricity, medicine, metallurgy, textiles, energy, etc. The globe valve is generally connected to the pipeline by flange connection or welding connection. Optional drive devices include: handwheel, bevel gear, electric, pneumatic, etc.
Check valves, also known as one-way valves or non-return valves, are automatically opened and closed by the force generated by the flow of the medium in the pipeline. They are an automatic valve. Check valves are used in pipeline systems. Their main functions are to prevent the backflow of the medium, the reverse rotation of the pump and its drive motor, and the release of the medium in the container. Check valves can also be used on pipelines that provide supply to auxiliary systems where the pressure may rise to a level that exceeds the main system pressure.
The main check valves produced by BTL are swing check valves and lift check valves.
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