What is the difference between hard seal gate valve and resilient seat gate value Manufactures
- Sealing material
Elastic resilient seat gate value and hard-seal gate valve are for the sealing material of the valve seat. The hard seal is precision processed with the seat material to ensure the accuracy of matching with the valve core (ball), generally stainless steel and copper. The resilient seat gate value means that the sealing material embedded on the valve seat is a non-metallic material. Because the soft sealing material has a certain degree of elasticity, the processing accuracy requirement is relatively low for the hard seal.
- Manufacturing process
Due to the complex working environment of many chemical and machinery industries, many of them are high temperature and high pressure, the friction resistance of the medium is large, and the corrosiveness is strong. Now the technology has improved, the use of various materials is better, and the processing can be followed. Now, the hard-seal ball valve has been widely promoted. In fact, the principle of hard seal gate valve is the same as that of resilient seat gate value, but because it is a seal between metals, it is necessary to consider the hardness relationship between metals, as well as working conditions, and what medium to go. Generally, hardening treatment is required, and continuous grinding between the ball and the valve seat is required to achieve a seal. Hard-sealed gate valves have a long production cycle and complicated processing. It is not easy to make hard-sealed ball valves.
- Conditions of use
Generally, soft seals can achieve very high seals, while hard seals can be high or low according to requirements; resilient seat gate value need to be fireproof, because at high temperatures, the material of soft seals will leak, while hard seals do not have this problem; hard seals Generally, it can be done at very high pressure, but the soft seal is not. The soft seal cannot be used in some occasions due to the problem of the flowing medium (such as some corrosive media); finally, the hard seal valve is generally more expensive than the resilient seat gate value. As for manufacturing, there is little difference between the two, mainly the difference between the valve seat, the soft seal is non-metal, and the hard seal is metal.
- Equipment selection
The selection of resilient seat gate value and hard seal gate valves is mainly based on the process medium, temperature and pressure. Generally, the medium contains solid particles or wears or the temperature is higher than 200 degrees. It is best to use hard seals. Valves with a diameter greater than 50 have a larger pressure difference and consider opening the valve torque. , When the torque is large, the fixed hard-seal gate valve should be selected, and its sealing level can reach 6 regardless of the soft or hard seal.
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