Type of valve

Valve valve

Gate valves, also called gate valves, are widely used valves. Its closing principle is that the height of the sealing surface of the gate plate and the sealing surface of the valve seat are smooth, flat and uniform, and they can prevent the flow of the medium and rely on the shape of the top mold, the spring or the gate plate to enhance the sealing effect. It mainly plays a cutting role in the pipeline.

The gate valve is divided into two types according to the stem thread, 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.

Stop valve

Cut-off valve, also called sectional door, is the most widely used type of valve. Its popularity is due to the small friction between the sealing surfaces in the opening and closing process. It is more durable, the opening height is not large, and it is easy to manufacture and maintain. Convenient, not only for medium and low pressure, but also for high pressure.

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

Butterfly valve

The butterfly valve is also called the butterfly valve. As its name implies, its key components are like butterflies facing the wind and free-wheeling.

The disc of the butterfly valve is a disc, which rotates around an axis in the valve seat. The size of the rotary angle is the degree of opening and closing of the valve.

4. Ball valve

The working principle of the ball valve is to rely on the rotary valve to make the valve open or blocked. The ball valve is light and compact, can be made into a large diameter, reliable sealing, simple in structure, and easy to maintain. The sealing surface and the spherical surface are often in a closed state and are not easy to be eroded by media. They are widely used in various industries.

There are two types of ball valves: one is a floating ball type and the other is a fixed ball type.

5. Plug Valve

The plug valve relies on the plug body to rotate around the center line of the valve body to achieve 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 overall dimensions are small, and only 90 degree rotation is required during operation, and the fluid resistance is not large. The disadvantages are that the switch is laborious, the sealing surface is easily worn, and it is easy to get stuck at high temperatures and is not suitable for adjusting the flow rate.

Plug valves, also known as cocks, cocks, turn the door. It is of many types, such as 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 role is to prevent the reverse flow of the medium. It has many names, such as check valves, check valves, and single-flow doors. According to the structure can be divided into two categories.

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 kinds of pressure reducing valves, mainly piston type and spring type.

A piston pressure reducing valve is a valve that decompresses by the action of a piston. Spring diaphragm pressure relief valves rely on springs and membranes for pressure equalization.

8. Steam trap

Traps are also known as stop valves, steam valves, traps, return tanks, and backwater gates. Its role is to automatically excrete continuously condensing water without letting steam out.

There are many kinds of traps, such as buoy type, float ball type, bell type float type, pulse type, thermodynamic type, and thermal expansion type. Commonly used buoy type, bell-shaped float and thermal power type.