The opening and closing part of the fire gate valve is the ram, and the movement direction of the ram is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The ram has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the ram valve form a wedge. The wedge angle varies with the valve parameters, usually 50. When the medium temperature is not high, it is 2 ° 52 ‘. The gate of wedge gate valve can be made into a whole, which is called rigid gate; It can also be made into a ram that can produce slight deformation to improve its processability and make up for the deviation of sealing surface angle during processing. This ram is called elastic ram.
The types of fire gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can also be divided into single gate type, double gate plate type and elastic gate type; Parallel gate valve can be divided into single gate plate and double gate plate. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and Non rising stem gate valve.
Features of fire gate valve:
1. Light weight: the body is made of high-grade nodular black cast iron, and the weight is about 20% ~ 30% less than that of the traditional gate valve, which is convenient for installation and maintenance.
Flat bottom gate seat: after the traditional gate valve is washed with water, foreign matters such as stones, wood blocks, cement, iron chips and sundries are deposited in the groove at the valve bottom, which is easy to cause water leakage due to the inability to close tightly. The bottom of the elastic seat seal gate valve adopts the same flat bottom design as that of the water pipe machine, which is not easy to cause sundries to deposit and make the fluid flow unobstructed.
2. Integral rubber coating: the ram adopts high-quality rubber for internal and external rubber coating. The European first-class rubber vulcanization technology enables the vulcanized ram to ensure accurate geometric dimensions, and the rubber and ductile iron casting RAM are firmly connected, not easy to fall off and have good elastic memory.
3. Precision casting valve body: the valve body is made of precision casting, and the precise geometric dimension makes it possible to ensure the sealing of the valve without any finishing inside the valve body.
Post time: May-31-2022