1. Valve

     Gate valves, also known as gate valves , are widely used valves. It is the principle of shutter closure sealing surface height of the seat sealing surface smooth, uniform smooth, bonded to each other, it can prevent the medium flows, and rely on a top mold, a spring, or shutter mode shape, to enhance the sealing effect. It mainly plays a cutting role in the pipeline.

     Its advantages are: small fluid resistance, strength hoist province, may be used in the case of the medium flowing in both directions, there is no directionality, the sealing surface is not easy to fully open the erosion, the short length of the structure is not only suitable for small valves, but also suitable for Large valve.

     The gate valve is divided into two types according to the thread of the valve stem . One is a light rod type and the other is a dark rod type. According to the structure of the gate , it is also divided into two categories , one is parallel and the other is mode.

2. The cut-off valve

Cut-off valve, also known as stop-gates, is the most widely used of a valve, it is the reason why the popularity is due to the small friction between the opening and closing process of sealing surface, durable and highly open small, easy to manufacture, maintenance Convenient , not only for medium and low pressure , but also for high pressure.

Its principle is closed, the valve relies on pressure bar, so that the valve sealing surface and the sealing surface in close contact with the valve seat, blocking medium flow.

The cut-off valve can only allow the medium to flow in one direction and has directionality when installed. Its structure length is larger than the gate valve , and the fluid resistance is large . In long-term operation , the sealing reliability is not strong.

Shutoff valves are divided into three categories : straight-through, right-angle, and direct-flow diagonal cut-off valves.


3. Butterfly
The butterfly valve is also called the butterfly valve . As its name implies , its key components are like a butterfly in the wind , free to swing. .

Is a butterfly flap disc, rotatable about an axis within a seat, the size of the rotation angle, that is the opening and closing of the valve.

The butterfly valve has the characteristics of light weight , saves material compared with other valves , has a simple structure , rapid opening and closing , cutting and throttling can be used , fluid resistance is small , and operation is labor-saving. Butterfly valve, can be made into large caliber. Butterfly valve can be used where it is best not to make valve, butterfly valve than the gate because of economic, regulatory and good. At present , butterfly valves are widely used in hot water pipes.

4. Ball valve

The working principle of the ball valve is to rely on the rotary valve to make the valve open or blocked. Valve switch light, small size, can be made large caliber, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, the media can not easily be Erosion, has been widely used in various industries.

Ball classified into two categories, one is a floating ball, and second fixed ball.

5. Plug valve

Stopcock plug is to rely on the valve body rotatable about the center line, for the purpose of opening and closing. Its role is to cut off, divide fields and change the direction of the medium. The structure is simple , the external dimensions are small , and only 90 degree rotation is required during operation, and the fluid resistance is not large. The drawback is difficult to open, the sealing surface easy to wear, easy to get stuck at a high temperature, not suitable for adjusting the flow rate.

Plug valves , also known as cocks, cocks, turn the door. It has many types , straight-through, Tri-formula and tetra-formula.

6. Check valve

The check valve is a valve that automatically opens and closes depending on the force of the fluid itself . Its function is Prevent media from flowing backwards. Its name is many , such as Check valves, check valves, single flow doors, etc. According to the structure can be divided into two categories.

(1) Lifting type : The valve flap hangs along the valve body Straight centerline moves. Such a check valve has two kinds: one is horizontal, installed in a horizontal pipe, the valve body is similar to shape and cut valve, and the other is vertical, mounted on the vertical pipe.

(2) Swing: the flap base to rotate about the pins outside, such valves are single Petals, double and multiple , but the principle is the same.
Absorbent bottom valve is a check valve of the pump suction pipe deformation, its structure due to the above-described two types of the same stop valve, but its lower end is open so as to allow water to enter.  

7. Pressure reducing valve

The pressure reducing valve is an automatic valve that reduces the medium pressure to a certain value . Generally, the pressure behind the valve is less than 50% of the pressure before the valve . There are many types of pressure reducing valves , mainly piston type and spring type.Racing Wheels

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