Butterfly valve JHP - Fluid Control Services
Butterfly valve JHP - Fluid Control Services
Butterfly valve JHP - Fluid Control Services
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<strong>JHP</strong><br />
The seat is made of filled PTFE in order<br />
to minimize plastic flow effects at high<br />
temperatures.<br />
The combined action of seat geometry<br />
and the elastic insert guarantees a long<br />
lasting bidirectional shuttoff.<br />
<strong>JHP</strong> FS<br />
or Fire Safe<br />
This <strong>valve</strong> has been designed to satisfy<br />
all fire test standards.<br />
In the event of fire, a metallic ring, in<br />
stainless material, takes over from the<br />
PTFE seat.<br />
High performances<br />
The ultimate design<br />
1. Pressure on same side of stem 2. Pressure on opposite side of stem<br />
In this case, the closing action of disc<br />
combined with slight trim deformation<br />
leads to compression of PTFE seat between<br />
disc and metallic insert.<br />
Subsequently, the seat takes support<br />
from the retaining ring, while the energized<br />
insert delivers a sealing pressure<br />
between disc and seat.<br />
The fluid flowing behind the seat<br />
increases the sealing effect. In fact, the<br />
<strong>JHP</strong> seat offers real dynamic in both<br />
directions.<br />
This bidirectional upstream/downstream<br />
tightness is maintained<br />
throughout the full rated pressure<br />
range.<br />
With fire, the excessive heat will destroy<br />
the PTFE seat (A) and will then be replaced<br />
by the metallic ring (B) which will<br />
provide a bidirectional back-up seal,<br />
limiting leakage to meet accepted standards.<br />
The <strong>JHP</strong> Fire Safe <strong>valve</strong>s<br />
are in accordance<br />
with API 607/BS 6755 part 2<br />
3
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