A Gate valve is really a linear motion on-off or shut-off valve. The gate-valve contains a disc or wedge having two seating surfaces that can in contact with the valve seats produce a seal for stopping the flow. The pressure differential involving the upstream flow direction and downstream side of wedge causes the wedge or disc to make against the downstream seat creating more effective sealing about the downstream side with the wedge. Gate valve sits dormant to regulate flow as erosion of disc and seat might cause leakage. A gate valve at stvvalves in partially open or closed position is additionally susceptible to vibration.

Where quick and frequent operation is critical use of quarter turn valves for instance ball valves and plug valves need to be considered.

In general, more common valve is at risk of leakage or rust after long-term use. We utilize the new material of rubber and elastic seat sealing technology within the cast steel gate valve manufacturing process to get rid of the defects of general gate sealing, rust, etc. The seat adopts an elastic disc to create an elastic deformation compensation effect to obtain a good sealing effect, and so the valve switch is light, the seal is reliable, as well as the service every day life is long. Which can be traditionally used in regular water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electrical energy, marine, metallurgy, energy systems and also other pipelines like a closed device.

Quarter-turn 2-way ball valves are the most common type of process control valve. They are 2-way (inlet and outlet), 2-position (open and closed) valves which are used for shut-off or isolation of your system, or perhaps a loop or component inside a system. The basic construction of an ball valve has a ball because the obstructer that is sandwiched between two cup shaped seals known as “seats”. Typically the ball features a bore straight through it. Media flows through this bore if the valve is open. When the ball is rotated 90?, the flow of media is stopped because of the sides on the ball which now completely fill the opening from the seats.

There are four forms of wedges: solid, hollow, split, and flexible wedge. The solid wedge can be a single-piece solid construction. It does not complete changes in seat alignment caused by pipe end loads or thermal fluctuations. As such it's most subject to leakage. Except for NPS 2 (DN 50) and smaller, solid-wedge discs are not recommended for easy use in applications having temperatures more than 250 deg F (121 deg C). Solid-wedge gate valves are definitely the most economical. Almost all small, NPS 2 (DN 50) and smaller, gate valves are solid-wedge gate valves. Solid-wedge gate valves usually are used in moderate in order to reduce pressure-temperature applications. It is common practice to make use of cast iron or ductile iron solid-wedge gate valves in cold or ambient water lines.

A hollow wedge can be a variation of solid wedge with the exception of an hole inside center. The hollow wedge travels on the stem if your threaded stem is rotated, thus opening or closing the valve port.

The flexible wedge can be one-piece construction such as a solid wedge, but areas behind the seating surfaces are worthless to provide flexibility. This construction compensates for modifications in seat alignment for improved seating and the strength of an solid wedge inside the middle. This design offers better leak tightness and improved performance in situations with possibility of thermal binding.