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Valve
Difference between Soft Seal Gate Valve and Hard Seal Gate Valve
2022-08-16

Soft seal and hard seal are judged according to the sealing material of the valve seat.


Soft seal: one side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material. This seal has good sealing performance, but it is not resistant to high temperature and abrasion, and has poor mechanical property.


Hard seal: both sides of the sealing pair are made of metal materials or other hard materials. The sealing performance of this seal is poor, but it has high temperature resistance, abrasion resistance and good mechanical performance.


1. Sealing Material

The sealing materials of the two are different. Rubber and polytetrafluoroethylene are generally used as sealing material for soft seal gate valves. Stainless steel and other metals are generally used as sealing material for hard seal gate valves.


2. Service Conditions:

(1) Soft seal can achieve zero leakage, while hard seal can be high or low according to requirements.

(2) The soft seal will leak at high temperature and needs fire protection. But the hard seal will not leak.

(3) Soft seal should be used with caution on some corrosive media. The sealing material of hard seal can select the corresponding corrosion-resistant material.


3. Price Cost

Under the same caliber, pressure and material, the hard seal gate valve is more expensive than the soft seal gate valve. If both hard seal gate valve and soft seal gate valve can be used under a certain working condition, soft seal gate valve should be selected as far as possible when you are considering the cost.


4. Service Life

1. The advantage of soft seal is good sealing performance, but the disadvantages are easy aging, easy wear and short service life.

2. Hard seal has a long service life, but its sealing performance is relatively worse than soft seal.

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