The difference between soft seal and hard seal of valve

The difference between soft seal and hard seal of valve

In addition to the corrosion resistant lining valve, the general soft seal valve refers to the spool or seat of one of the two non-metallic materials (mainly PTFE, rubber, etc.) sealed form of the valve. The sealing effect of soft seal valve is better, but in the pipeline installation, system cleaning may leave more or less unclean debris (such as welding slag, iron filings, etc.), they flow through the regulating valve, easy to scratch the soft seal seat or spool, so that the leakage amount increases, the reliability of the seal is poor. Therefore, the choice of soft seal structure must consider the medium cleaning and strict flushing pipeline before operation.
Valve soft seal and hard seal difference:
(1) Soft seal
In addition to the corrosion resistant lining valve, the general soft seal valve refers to the spool or seat of one of the two non-metallic materials (mainly PTFE, rubber, etc.) sealed form of the valve. The sealing effect of soft seal valve is better, but in the pipeline installation, system cleaning may leave more or less unclean debris (such as welding slag, iron filings, etc.), they flow through the regulating valve, easy to scratch the soft seal seat or spool, so that the leakage amount increases, the reliability of the seal is poor. Therefore, the choice of soft seal structure must consider the medium cleaning and strict flushing pipeline before operation.
(2) Hard seal
Hard seal and surfacing of wear-resistant alloy is a better choice for cutting off valves. This way in consideration of sealing and also consider the service life and reliability, although the factory index is only 10-6 ~ 10-8, can not achieve the effect of soft seal zero leakage, but enough to meet the requirements of tight cut, and it is durable, from the economic point of view is more cost-effective.
Valve model edit meaning
Various valve models edit specifications meaning such as the title; BZ 3 4 1 H _16 C
(B) special structure code; (Z) Type code; (3) Driving mode code; (4) Connection form code; (1) Structural form code
B….. Insulation type X… Cock 0… The electromagnetic actuator 1… Internal thread
D….. Low temperature type D… Butterfly valve 1.. Electromagnetic fluid 2… External thread
F…… Fire type H… The check valve 2… Electric hydraulic 4… flange
H….. Slowly-closing type J… Globe valve 3… Turbine 6… welded
P….. Slag discharge type Q… Ball valve 4… Spur gear 7… The clip
Q….. Fast type Z… Gate 5… Bevel gear 8… clamp
W… Bellows type 6… Pneumatic 9… Card set
7… hydraulic
8… Gas-liquid motion
9… electric
(H) Sealing surface material code (16) Pressure class (C) body material
B…. Babbitt 10… 1.0 Mpa C… Carbon steel
D…. Nitriding steel 16… 1.6 Mpa F… Low carbon steel
F…. Fluorine plastic 25… 2.5 Mpa I… Chrome molybdenum steel
H… Cr13 stainless steel 40….. 4.0 Mpa P… Chromium-nickel stainless steel
J…. Rubber lining 63… 6.3 Mpa R… Chromium-nickel-molybdenum stainless steel
M… Monel alloy 100.. 10.0 Mpa Ti… Titanium and titanium alloys
N… Nylon plastic 160.. 16.0 Mpa V… Molybdenum chrome vanadium steel
W. Same as the main material 250.. 25.0 Mpa
X… Rubber 320.. 32.0 Mpa
Y… Cemented carbide 420.. 42.0 Mpa