Easy to operate | Gate valve | Affordable

COVNA Flange Wedge gate valve opens by lifting a gate with wedge shape, out of the path of afluid. The sealing surface in between the gate and seats are planar, and once lifted, there are not obstructions in the flow path, so they are used when a minimum friction is required.Widely used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and all most any services.

COVNA HK59-D-D Pneumatic knife gate valve is driven by compressed air. Pneumatic knife gate valve is simply to use pneumatic actuator to control the valve, so as to achieve the opening and closing of the valve. It can be divided into two parts: upper part is pneumatic actuator and lower part is valve. The pneumatic knife gate valve should be installed horizontally in the pipeline. The opening and closing parts of the pneumatic knife gate valve are the gate, the movement direction of the gate is perpendicular to the direction of the fluid, and the manual knife gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled.

Multi-tumn valve electric actuator, known by the name of Z-type, which is used for opening, closing or adjusting the valves, is an essential actuating device which can be used for remote control, centralized control and self control to the valves, with the features of comprehensive function, reliable performance, advanced controsystem, small volume, light weight, convenient application and maintenance and so on. It can be applicable to the valves, whose open-close parts will move in a straight line, such as gate valve, stop valve, diaphragm valve, anchor gate, water gate valve and so on.

The gate valve of the gate valve moves linearly with the valve stem, which is also called a rising stem gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is turned into operating thrust. When the valve is opened, when the lift height of the gate is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as the mark, that is, the unmovable position, as its fully open position. In order to take into account the temperature change and the lockup phenomenon, it is usually at the top of the opening position, and then rewind 1/2-1 turn, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (that is, stroke). Some gate valve stem nuts are set on the gate, and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. This kind of valve is called Rotating stem gate valve or dark stem gate valve.