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The main difference between pneumatic ball valve soft and hard seal
Pneumatic ball valve seals are divided into soft seals and hard seals. There are certain differences in the use of soft and hard seals, mainly in terms of structure, mainly due to the different manufacturing standards for valves. When the track hard-seal pneumatic ball valve is in the fully-closed position, the hand wheel rotates counterclockwise. In cooperation with the stem nut and the thrust bearing, the valve stem starts to rise, and the valve ball starts to rotate.
Production Process
Structural mechanism: The hard seal of pneumatic ball valve is the seal between metal and metal, and the sealed ball and valve seat are all metal. It is difficult to process precision and technology, generally used in high pressure, usually 35MPa or more. Soft seals are seals between metal and non-metal, such as nylon/PTFE, and the manufacturing standards are the same.
On the sealing material: The soft and hard seal is for the sealing material of the valve seat, and the hard sealing is precisely processed with the seat material to ensure the accuracy of the fitting with the valve core (spherical body). Stainless steel and copper are generally used. Soft sealing means that the sealing material embedded in the valve seat is a non-metallic material. Because the soft sealing material has a certain degree of elasticity, a relatively hard sealing of the processing accuracy will be low.
On the manufacturing process: due to many chemical and mechanical industries, the working environment is more complicated, and many of them are high temperature and high pressure. The frictional resistance of the medium is large and the corrosion is strong. Now the technology has been improved, the use of various materials is better, processing, etc. Can keep up with the aspects, so that the hard-sealed pneumatic ball valve has been widely promoted.
Conditions of use: soft seals generally achieve high seals, while hard seals can be as high or low as required; soft seals require fire protection, because at high temperatures, soft seal materials will leak, and hard seals do not have this Problems; hard seals can generally do very high pressure, soft seals do not; soft seals due to the problem of the medium flow, some occasions can not be used (such as some corrosive media); the final hard seal valve is generally better than the soft seal expensive. As far as manufacturing is concerned, the difference between the two is not significant. The main difference is the valve seat. The soft seal is non-metal, and the hard seal is metal.
In the equipment selection above: soft, hard seal pneumatic ball valve selection based on the process medium, temperature and pressure, the general medium contains solid particles or wear or temperature is better than 200 degrees the best choice for hard sealing, caliber greater than 50 valve pressure difference Large also consider opening the valve torque size, the larger the moment should be used fixed hard-seal pneumatic ball valve, regardless of the soft and hard seal its sealing level can reach 6 levels.
product comparison
The principle of the hard-seal pneumatic ball valve is the same as that of the soft seal. However, due to the seal between the metals, the hardness relationship between the metals, the operating conditions, and the medium to be taken should be taken into consideration. Hardening treatment is generally required, and the balls and the seat must be constantly ground to achieve sealing. The hard-sealed pneumatic ball valve has a long production cycle, and the processing is complicated. It is not easy to make a hard-seal pneumatic ball valve. Therefore, in order to be able to make this product, the company introduced the most advanced technology in France.
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