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The opening and closing part of the gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only It cannot be adjusted or throttled when fully open or fully closed.
Valve body material: brass, cast iron, cast steel, stainless steel, forged steel, chromium molybdenum steel, chromium molybdenum vanadium steel, sealing surface material. Working pressure working temperature. Valve size. Connection method: flange welding internal thread. Transmission mode: manual spur gear, bevel gear, pneumatic and electric. Applicable medium: water, oil, gas, steam, acid. Manufacturing standards include national standard, American standard, Japanese standard and German standard.
The gate has two sealing surfaces. In the most commonly used mode, the two sealing surfaces of the gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 0.00000000000000000000000000000000. The gate of the wedge gate valve can be made into a whole, which is called a rigid gate. It can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate It's called an elastic gate.
The types of gate valves can be divided into wedge gate gate valves and parallel gate gate valves according to the sealing surface configuration. Wedge gate gate valves can also be divided into single gate type, double gate type and elastic gate type. Parallel gate gate valves can be divided into It is single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and concealed stem gate valve. When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing surface sealing, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
The gate plate of the gate valve moves linearly with the valve stem. It is called a lifting stem gate valve or a rising stem gate valve. Usually there is a trapezoidal thread on the lift rod, and through the nut of the valve and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into the operating thrust.
When the valve is opened, when the lift height of the gate plate is equal to times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon caused by temperature changes, it is usually opened to the top position and then retracted/turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate, that is, the stroke. Some gate valve stem nuts are set on the gate plate, and the rotation of the handwheel drives the valve stem to rotate, thereby lifting the gate plate. This kind of valve is called a rotating rod gate valve or a concealed rod gate valve.
The gate valve has the following advantages: small body resistance, and the sealing surface is less brushed and eroded by the medium. It saves effort to close. The mass flow direction is not restricted, and there is no flow disturbance or pressure reduction. It has a simple body, short structural length, good manufacturing process, and wide application range. The disadvantages of the gate valve are as follows: the covers are prone to erosion and scratches, making maintenance difficult. The shape is large, requires a certain amount of space to open, and takes a long time to open and close. The structure is more complex.
When installing and maintaining the gate valve, the following matters should be noted. The wheel handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited. The gate valve should be installed vertically, that is, the valve stem is in a vertical position and the handwheel is at the top. Before opening the gate valve with a bypass valve, the bypass valve should be opened first to balance the pressure difference between the inlet and outlet and reduce the opening force. The gate valve of the transmission mechanism must be installed according to the product instruction manual. If the valve is used frequently on and off, lubricate it at least once a month.
Characteristics of elastically seated gate valves. For a long time, general gate valves used on the market have commonly suffered from water leakage or rust. Our company introduced the elastically seated gate valves produced by European high-tech rubber and valve manufacturing technology, which overcomes the common gate valve sealing problem. Defects, rust and other defects, the elastic seat seal gate valve uses the elastic gate plate to produce trace elastic deformation compensation to achieve a good sealing effect. The valve has significant advantages such as light switching, reliable sealing, good elastic memory and service life.