Technical performance of the valve

Strength properties of the valve is the valve's ability to withstand the media pressure. Valve is a pressure of mechanical products, and therefore must have sufficient strength and rigidity to ensure the long-term use without breakage or deformation.

Sealing performance
The sealing performance of the valve is the valve part of the sealing ability to prevent media leaks, it is the valve most important technical performance indicators. Sealing valve has three parts: opening and closing pieces and valve seat sealing surface between the contact points; filler stem and the stuffing of the distribution and office; junction body and bonnet. Which is called before a leak within the leak, also known as loose relationship, it will affect the ability of the valve cut off media. For the cut valve, the internal leakage is not allowed. Leakage after the two called the leak, that media leaks from the valve to the valve outside. Leakage will result in material losses, environmental pollution, can also cause serious accidents. The explosive, radioactive medium, leakage is allowed, and therefore, the valve must have a * sealing performance.

Flowing medium
Will produce medium flow through the valve after the pressure loss (both before and after the valve pressure difference), which is the flow valve on the media have a certain resistance, medium to overcome the resistance of the valve, it takes some energy. From the conservation of energy considerations, the design and manufacture of valves, to minimize the resistance of the valve on the flow medium.

Hoisting force and hoisting moment
Hoisting force and hoisting moment is the valve to open or close the force or torque must be imposed. Close the valve, the need to open and close between the two pieces with the fat seat sealing surface of the seal formed between certain specific pressure, but also to overcome between the stem and the packing between the stem and the nut thread between the stem end bearing at and other friction parts of friction, and therefore must apply the closing force and closing moments, in the valve opening and closing process, the need to stop force and the opening and closing moments of change, and its maximum is close to the final instant or open the initial transient. Design and manufacture of valves should strive to reduce the closing force and closing moments.

brass valve

Hoisting Speed
Hoisting speed is used to open or close the valve to complete a movement time required to represent. Valves open and close the general speed is not critical, but some conditions have special requirements for opening and closing speed, the prompt to open or close, to prevent accidents, and some asked slowly shut down to prevent water hammer, etc., this should be taken into account in the selection of valve type.

Action sensitivity
This refers to the valve for the medium parameters, and make the appropriate degree of sensitivity. The throttle valve, reducing valve, regulating valve used to adjust the medium parameters valve and safety valve, trap with a specific function such as valves, the sensitivity of its function is very important technical performance indicators.

Life
It indicates the durability of the valve, the valve is an important performance indicators and has great economic significance. Usually guarantee the number of seals required to open and close that can also be used to indicate the time.