Valve valve sealing performance is part of the sealing ability to prevent media leaks, it is the most important technology valve performance. Sealing valve has three parts: opening and closing pieces and valve seat sealing surface between the two contact points; packing and stem and stuffing the distribution and office; body and bonnet connection.

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 truncated 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, will result in serious accidents. The explosive, toxic or radioactive medium, leakage is allowed, and thus the valve must have a reliable sealing performance.

Mobile media medium flow through the valve will generate pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium resistance to overcome 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 media.

Force and torque hoist hoist hoist hoist force and torque is the valve open or closed by the force or torque to be applied. Close the valve, the need to open and close parts and Development Block formed between the two sealing surface sealing than a certain pressure, but also to overcome between the stem and packing, the stem and between the nut thread, the stem ends of the Bearing friction and other friction parts, which must exert closing force and closing moments, the valve in the opening and closing process, the force needed to open and close and open and close torque is changing, and its maximum is close to the final instant or open the initial transient. Design and manufacture of valve closing force should seek to reduce and close the moment.

Hoisting speed of opening and closing speed is an opening or closing the valve action to complete the time required to represent. The valve opening and closing speed generally no strict requirement, but some conditions have special requirements on the opening and closing speed, if the requirements of rapidly turned on or off, to prevent accidents, and some asked slowly closed to prevent water hammer and other produce This should be in the selection of valve types to be considered.

Sensitivity and reliability of this action is the valve for the medium parameters and make the appropriate degree of sensitivity. The throttle valve, reducing valve, regulating valve used to adjust the valve and safety valve medium parameters, the trap has a specific function such as valves, its function is very important to the sensitivity and reliability of technical performance indicators.

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

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