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Application Guide

Valves for Fire Protection Systems

Fire protection systems demand valves that are reliable, tamper-indicating, and listed by recognised testing authorities (FM Global, UL, or LPC). From OS&Y (Outside Screw and Yoke) gate valves on sprinkler risers to deluge valves on foam-water systems protecting oil tank farms, and butterfly valves with supervisory switches on fire water mains — every valve must provide visual indication of position, resist unauthorised closure, and open fully with no flow restriction. Vajra Industrial Solutions supplies FM/UL-listed fire protection valves for sprinkler, deluge, foam, and fire hydrant systems complying with NFPA 13 (USA), IS 15105 (India), and EN 1074 (Europe).

NFPA 13 (Sprinkler Systems)IS 15105 (India Fire Valve)UL 262 / FM 1210 (Gate Valves)UL 668 / FM 1112 (Butterfly Valves)EN 1074-6AWWA C509 / C515IS 5290 (Fire Hydrant)
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Recommended Valve Types for Fire Protection Systems

OS&Y Gate Valve (FM/UL)

Class 150 / PN 16

Why: Sprinkler system riser isolation — OS&Y design provides visual open/close indication; tamper-indicating; UL 262 listed

Materials: A216 WCB body; SS316 stem (outside screw visible = open); ductile iron variants for lower cost

Standards: UL 262, FM 1210, NFPA 13, IS 15105

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Butterfly Valve (Supervisory Switch)

Class 150 / PN 16

Why: Fire water main and zone valves — large bore, tamper-switch for alarm panel supervisory signal; FM approved

Materials: WCB body; ductile iron or SS316 disc; EPDM seat; integral supervisory tamper switch

Standards: UL 668, FM 1112, NFPA 13, AWWA C504

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Deluge Valve

Class 150 / PN 16

Why: Automatic water/foam-water release on fire detection signal — used for process plant protection, tank farms, hangar protection

Materials: WCB or ductile iron body; stainless steel trim; EPDM diaphragm or clapper

Standards: UL 260, FM 1020, NFPA 15 (Water Spray), IS 15105

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Check Valve (Fire Water)

Class 150 / PN 16

Why: Fire water pump discharge and riser back-flow prevention — prevents back-syphoning of contaminated water into potable mains

Materials: WCB or ductile iron; rubber seat; SS316 hinge pin

Standards: UL 312, AWWA C508, NFPA 13

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Critical Requirements

FM Global or UL listing mandatory for all valves on automatic sprinkler systems (NFPA 13 Clause 6.1) — unlisted valves are not accepted by insurance underwriters
OS&Y (Outside Screw and Yoke) design mandatory for sprinkler system control valves — the screw position provides immediate visual indication; alternatively, post-indicator or wall-indicator valve types are used outdoors
Supervisory tamper switch mandatory for all fire system valves — connected to fire alarm panel to alert when valve is partially or fully closed
No pressure drop — full-bore gate valves only; no globe valves on sprinkler mains (excessive pressure drop reduces sprinkler design density)
IS 15105 compliance for Indian projects — Indian standard for fire fighting valves; requires BIS certification for some valve types
Firewater main valves must be car-sealed open (CSO) or locked open — cannot rely on procedural controls alone

Fluid & Service Challenges

⚠Fire water (raw river, tank, or municipal supply) — mineral-laden, biological growth risk; rubber seats and linings resist deposits better than metal seats
⚠Foam-water for tank farm protection — AFFF or AR-AFFF concentrate; EPDM seats compatible with all foam types
⚠Dry pipe systems — pressurised air until actuation; valve must operate at low temperatures in freezing climates
⚠High-expansion foam systems — low-density foam blanket; requires large-bore deluge valves for rapid coverage
⚠Wet chemical (kitchen suppression) — potassium carbonate solution; SS316L for chemical compatibility

Material Selection Guidance

Standard fire water service: ductile iron or WCB body with rubber seat — economical, listed options widely available. Corrosive water or seawater firewater: SS316L or rubber-lined body. Foam-water deluge: WCB body with EPDM diaphragm and SS316 trim — EPDM compatible with AFFF and AR-AFFF. OS&Y gate valves: WCB body with bronze or SS316 stem — OS&Y configuration required by NFPA 13 for all control valves in automatic suppression systems.

Typical Service Points

Industrial plant sprinkler system — UL/FM OS&Y gate valves on risers and zone valves (Class 150, PN 16)
Oil tank farm foam-water protection — deluge valves with foam proportioner (DN80–DN200, PN 16)
Process plant fire water main — butterfly valves with supervisory tamper switch (DN100–DN600, Class 150)
Offshore platform firewater — SS316L or Super Duplex butterfly valves (seawater firewater)
High-rise building sprinkler — OS&Y or butterfly valve with supervisory switch (DN50–DN200)
Fire hydrant mains — ductile iron or WCB gate valves (underground, DN100–DN300)

FAQ — Valve Selection for Fire Protection Systems

Why must fire protection valves be FM or UL listed?
FM Global and UL (Underwriters Laboratories) are independent testing organisations that verify that fire protection equipment performs as specified under fire and flow conditions. Insurance companies (FM Global insures many large industrial facilities) and building codes (NFPA 13) require listed equipment because unlisted equipment has not been tested to a known standard — an unlisted valve might fail to open in an emergency, potentially causing catastrophic loss. In India, IS 15105 provides the equivalent national standard, and BIS-certified valves meet IS 15105 requirements.
What is the difference between an OS&Y valve and a post-indicator valve (PIV)?
Both are tamper-indicating valves used as fire system control valves. OS&Y (Outside Screw and Yoke) gate valves show valve position by the exposure of the threaded stem — when the stem is visible (screwed out), the valve is open. They are used indoors (inside riser closets, valve rooms). Post-Indicator Valves (PIV) are used outdoors — a cast iron post extends from the buried valve with a window showing 'OPEN' or 'SHUT'. PIVs don't require an above-ground valve room and are preferred for large outdoor industrial complexes and warehouses.

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Fire Protection Systems

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Key Standards

NFPA 13 (Sprinkler Systems)
IS 15105 (India Fire Valve)
UL 262 / FM 1210 (Gate Valves)
UL 668 / FM 1112 (Butterfly Valves)
EN 1074-6
AWWA C509 / C515
IS 5290 (Fire Hydrant)

Products for This Application

Gate ValvesButterfly ValvesCheck ValvesAccessories

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