Habonim Catalog Interactive 2024 V04 15022024 - Catalog - Page 22
VALVE FEATURES
Fire Safe Design
Valves to be used in explosive or fire-hazard areas need to be (according to some standards
and regulations) be designed to prevent in-line leaks for at least 30 minutes when exposed
to flames and/or temperatures between 900 - 1000°C. In addition, after cooling down, a firesafe valve has to be able to be cycled once and seal at an acceptable level of in-line leakage.
Habonim fire-safe valves include body seals fabricated from graphite, which is well-known as
a fire-retardant material. In the event of fire, the valve’s soft seats melt and the ball is pressed
against a metallic fire lip on the downstream end connector thus preventing in-line leakage.
The fire also burns off the stem’s thrust seal, causing the stem, which has a machined chamfer
at its root, to be pushed up and form a metal-to-metal seal with the valve body and prevent
leakage. For stem sealing Habonim is using the patented HermetiX seal, a unique polymerbased graphite-free stem seal that, even after its polymer materials have melted, allows the
stem to stay aligned and fully operable after cool-down. During normal operation, our polymerbased stem seal allows 500,000 operation cycles without maintenance, making it remarkably
more durable than porous graphite seals, which have to undergo maintenance every 5,000
cycles without refurbishment. This design has been tested and certified to API 607 and ISO
10497 standards.
Tongue & Groove Body Seal Design
A ‘tongue’ machined on one side of the valve body and a matching ‘groove’ machined on the
opposite side provides a perfect interlock system that precisely aligns the body and ends
along the valve’s center axis, thus increasing accuracy and repeatability during valve assembly
and maintenance. The tongue & groove design is used most of our fire valves so that the
expanded body seal is fully encapsulated and compressed in the event of a fire. The tongue &
groove design forces fluid emissions to flow in a labyrinth pattern, thus ensuring zero leakage
into the atmosphere.
Body Bolts
Instead of long through-way bolts and nuts, all of our 3-piece fire-safe valves use double the
number of one-size-up short bolts threaded into the body. In the event of fire these bolts
minimize thermal expansion and prevent external leakage.
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VALVES
