a, ball valve

ball Industrial Valves, open-close part ( A sphere) Driven by the stem and round ball valve axis rotation movement of the valve.

:

1, wear-resisting, due to the hard seal ball valve of the valve core is alloy spray welding, sealing ring is alloy steel welding, so hard seal ball valve when the switch is no wear and tear. （ Its coefficient of hardness is 65 - 70). :

2, sealed performance is good, because of the hard sealing ball Industrial Valves's sealing is using artificial grinding, until the valve core and seal completely fit to use. So he sealed performance is reliable.

3, light switch, adopting the spring because of hard seal ball valve at the bottom of the sealing ring sealing ring and valve core embrace together tightly, so in the outside powers over spring pre-tightening force when the switch is very light.

4, long service life, has been widely used in petroleum, chemical, power, papermaking, atomic energy, aviation, rockets and other departments, as well as People's Daily life. Advantages:

1, the fluid resistance is small, its resistance coefficient with section of equal length.

2, simple structure, small volume, light weight.

3, compact and reliable, and ball valve sealing surface of materials widely used plastic, sealing is good, have been widely used in the vacuum system.

4, convenient operation, opening and closing rapidly, from open to close just rotate 90 °, is advantageous for the remote control.

5, convenient maintenance, ball valve has simple structure, sealing ring, which generally remove replacement is more convenient.

6, wide applicable scope, size from small to several millimeters, big to a few meters, high vacuum or high pressure can be applied.

2, gate

( A) Rising stem gate valves: turn the handwheel by hand wheel and screw thread of the valve stem of the advance and retreat, lifting or lowering the valve plate connected to the valve stem, reach the role of opening and closing.

stem gate valve has the following advantages:

1, small fluid resistance, sealing surface of erosion and erosion by the medium.

2, open and close more effort.

3 to the flow direction of medium, not restricted, disturbed flow, reduce the pressure.

4, simple form, the structure length is short, make good manufacturability, wide application scope.

the shortcoming of rising stem gate valves are as follows:

1, easy cause surface erosion and abrasion, the maintenance is difficult.

2, appearance size is larger, open needs certain space, open and close time is long.

3 and complicated structure.

( 2) Non-rising stem gate: also called rotating lever gate ( Also called non-rising stem wedge gate valve) 。 Stem nut in ram, hand wheel rotate to drive the stem, and make the damper to ascend, usually at the bottom of the valve stem has a trapezoidal thread, through the valve at the bottom of the thread and the guide groove on the disc, the rotary motion to linear motion, which is the operating torque thrust into operation.

3, butterfly valve, butterfly valve, also called the flap valve, is a kind of simple structure of the regulator and can be used for low pressure pipeline medium of the butterfly Industrial Valves is closed switch control. ( Disc or disc) As the disc, shaft rotation around the valve to open and close a valve.

4, globe valve, check valve flow refers to rely on the media itself, and automatic opening and closing valve, used to prevent the backflow medium valve, also known as the non-return valve, check valve, valve, and the back pressure valve upstream. Check valve belongs to a kind of automatic valve, its main role is to prevent the backflow medium, to prevent the pump and drive motor reversal, and the discharge of the container medium.

5, safety valve, safety valve is open-close part under the action of external force in a normally closed state, when the equipment or piping within the medium pressure than specified value, through a discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed special valves. Relief valve belong to automatic valve class, mainly for the boiler, pressure vessel and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role.

6, low leakage and high sealing valve: the role of the low discharge and high sealing valve: is to prevent system due to the accumulation of gas leakage caused by driving system misoperation and set the valve in the pipeline. Installed it in the way of system startup tube, under normal circumstances in an open position, only to achieve the set pressure in inlet pressure closed, its role is largely ruled out due to air leakage product

pressure reducing valve,

( A) Proportional pressure reducing valve, pilot valve opening is used at the top of the adjusting bolt clockwise budge, make spring elastic retraction, the pilot valve diaphragm dent, the forces acting on the pilot valve connecting rod, a channel valve downward displacement. After the pilot valve opens, the upstream admission section A of the steam chamber through the alpha channel ( Steam adjusting channel) , through the pilot valve into the pilot valve steam ring cavity, and directly by the beta channel to the piston cylinder cavity. Under A continuous supply of steam cavity, increasing pressure, driving the piston downward to open the main valve, the steam flowing from A to B cavity cavity flow. When the downstream outlet section B under the condition of load to satisfy, yu more steam and B cavity pressure rising. The pressure of the rising by gamma channel ( Pressure sensing channels) Feedback to the pilot valve of diaphragm, the pilot valve diaphragm upward bumps, overcome the upper adjust the spring pressure, pilot valve is up or shut down. Thus, up or shut down steam source from upstream alpha channel. When the piston cylinder cavity pressure drop, in under the action of the reset spring, the main valve is up or shut down, then B cavity pressure began to decline, so the cycle to achieve the purpose of regulating.

is frequently used by people in daily life since it can improve os gate valve and cast iron valve.
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