China gate valve features

The china gate valve is the most widely used of all kinds of valves.

China gate valve refers to the valve that moves the closing member along the vertical direction of the channel axis. It is mainly used as the cutting medium in the pipeline, that is, it is fully open or fully closed. It is rarely used for regulating flow. The gate valve is not suitable for conveying mud and other media.

The most commonly used gate valves are slab gate valves and wedge gate valves. According to the structure of the valve stem, they can also be divided into open gate valves and dark gate valves. The slab gate valve is divided into a single gate valve and a double gate valve. In addition, there are variants of the knife gate valve and the slurry valve. The knife gate valve and the slurry valve are widely used in the papermaking and water treatment industries. Let's take a brief look at the slab gate valve, wedge gate valve and knife gate valve.

A slab gate valve is a sliding valve in which the closing members are parallel rams. The closing member may be a single shutter or a double shutter with a distracting mechanism therebetween. The pressing force of the shutter to the valve seat is controlled by the medium pressure acting on the floating shutter or the floating valve seat. In the case of a double gate slab gate valve, the expansion mechanism between the two shutters can supplement this pressing force.

The slab gate valve can be divided into a manual slab gate valve, a pneumatic slab gate valve and an electric slab gate valve according to the driving mode. According to the use and use occasions, it can be divided into sluice gate valve with diversion hole, slab gate valve without diversion hole, oil plate slab gate valve, pipeline slab gate valve and gas slab gate valve.

A wedge gate valve is a type of gate valve. It is named because its sealing surface is at an angle to the vertical centerline, that is, the two sealing faces are wedge-shaped. In general, the two sealing surfaces are wedge-shaped gate valves, and the angle between the sealing surface and the vertical center line is 2°52', 3°30', 5°, 8°, 10°, and the like. The opening and closing member of the wedge gate valve is a gate. The direction of movement of the gate is perpendicular to the direction of the fluid. The wedge gate valve can only be fully open and fully closed, and is not suitable for adjustment and throttling. The wedge gate valve generally opens and closes the valve through the valve stem moving up and down with the rotating handwheel. There are two types of open wedge wedge gate valves and dark wedge wedge gate valves. The stem wedge valve is a valve stem that moves up and down and the stem nut is fixed. The dark rod gate valve is fixed by the valve stem, and the stem nut has been moved up and down.

The knife gate valve is also called knife gate valve, knife gate valve, slurry valve and mud valve. Its opening and closing member is a gate. The direction of movement of the gate is perpendicular to the direction of the fluid, and is cut by a blade-shaped shutter that can cut the fiber material. The medium and the gate have two sealing faces. The two sealing faces of the most common mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 5°. The gate of the wedge knife gate valve can be made into one. The whole is called a rigid ram; it can also be made into a ram that can produce a small amount of deformation to improve its processability and compensate for the deviation of the sealing surface angle during processing. This ram is called an elastic ram. The valve body does not actually have a chamber, the shutter lifts in the side guide groove, and the lug at the bottom is pressed against the valve seat. If a high medium sealing property is required, an O-shaped sealing seat can be used. Two-way seal. The knife gate valve has a small installation space, low working pressure, is not easy to accumulate debris, and has a low price.