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Application Guide

Valves for HVAC & Building Services

Commercial buildings, hospitals, data centres, airports, and large residential complexes require a wide range of valves for HVAC systems (chilled water, hot water, condenser water), fire suppression (deluge, sprinkler), domestic plumbing, and cooling tower circuits. These applications demand valves with long service life, actuator compatibility for BMS integration, and in the case of fire suppression, UL listing or FM Approval.

ASME B16.34EN 12266 (Industrial valve testing)UL Listed (Fire suppression valves)FM Approval (Fire protection)IS 778 / IS 780 (Indian plumbing valves)NFPA 13 (Sprinkler systems)BS 1010 / EN 12614 (Bronze valves)
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Recommended Valve Types for HVAC & Building Services

Concentric Butterfly Valve (Wafer / Lug)

PN 10 / PN 16

Why: Low cost, compact, and easy to automate — standard isolation and balancing valve for chilled water and condenser water

Materials: Ductile iron (GGG-50) body, SS 316 disc, EPDM seat for chilled/hot water

Standards: EN 593, EN 12266, IS 13095

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Ball Valve (Full Bore, Stainless)

Class 150 / PN 16 / PN 40

Why: Quick quarter-turn isolation on AHU connections, fan coil unit pipework, and condensate drain lines

Materials: SS 316 body and ball, PTFE seats — or carbon steel ball valve for large sizes

Standards: ASME B16.34, EN 12266, BS 5351

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Globe Valve (Control / Balancing)

PN 10 / PN 16 / Class 125 / Class 150

Why: Two-way and three-way flow control and balancing in chilled water and hot water circuits; AHU coil control

Materials: Cast iron or bronze body, SS 316 or bronze trim, EPDM packing

Standards: ASME B16.34, EN 12266, BS 5352

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Gate Valve (Isolation, HVAC Headers)

PN 10 / PN 16 / Class 125

Why: Full-bore isolation on main chilled water, hot water, and condenser water headers and risers

Materials: Cast iron or ductile iron, bronze trim, rising or non-rising stem

Standards: ASME B16.34, IS 780, EN 12266

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Critical Requirements

Actuator compatibility for BMS (Building Management System) integration — standard ISO 5211 flange mounting
UL Listed / FM Approved valves for fire suppression (sprinkler, deluge, foam) circuits
Low pressure drop design for butterfly and ball valves on chiller circuits — minimises pump energy
EPDM seat material rated for both chilled water (7–12°C) and hot water (up to 95°C) in 4-pipe systems
Grooved-end (Victaulic) and flanged end connections for building services piping
Tamper-resistant OS&Y (outside screw and yoke) gate valves for fire suppression mains — visible open/closed indication

Fluid & Service Challenges

⚠Chilled water with glycol (below 0°C in cold climates) — EPDM seats rated for glycol service, low-temp ductile iron
⚠Condenser water (open-loop, biological growth risk) — EPDM and ductile iron withstand microbiologically influenced corrosion (MIC) inhibitor treatment
⚠Hot water (80–95°C in district heating systems) — EPDM seats rated to 130°C+
⚠Fire water (standing service, periodic operation) — OS&Y gate valves with tamper indicators, periodic proof-test required
⚠Domestic cold water (chlorinated, potable) — NSF 61 or WRAS-approved elastomers for potable water contact

Material Selection Guidance

For chilled water and condenser water circuits (HVAC): ductile iron body with EPDM seat butterfly valves (PN 10/16) for DN 65 and above; brass or SS 316 ball valves for DN 15–50. For hot water (80–95°C): EPDM-seated butterfly valves rated to 120°C. For fire suppression: UL-listed ductile iron gate valves (OS&Y) or butterfly valves with tamper switches. For domestic cold water: brass or bronze ball valves and gate valves complying with IS 778 or BS 1010. For glycol circuits: ensure EPDM or PTFE seat rated for propylene glycol / ethylene glycol at operating temperature.

Typical Service Points

Chilled water primary and secondary circuits
Condenser water (cooling tower) isolation and balancing
Air Handling Unit (AHU) and Fan Coil Unit (FCU) coil connections
Domestic hot and cold water distribution (plumbing)
Fire suppression main isolation (OS&Y gate or butterfly)
Sprinkler zone control valves
District cooling and heating network isolation
Data centre precision cooling systems

FAQ — Valve Selection for HVAC & Building Services

What valves are required for fire suppression systems in buildings?
Fire suppression systems (sprinkler, deluge, foam) require UL-listed or FM-approved valves for all isolation and control functions. Common types: OS&Y (Outside Screw and Yoke) gate valves — the stem position visually indicates open/closed, required by NFPA 13 for fire service mains; butterfly valves with tamper switches for zone control; check valves for backflow prevention. In India, IS 15105 and NBC (National Building Code) fire systems also reference UL-listed components.
What is an OS&Y valve and why is it used in fire sprinkler systems?
An OS&Y (Outside Screw and Yoke) gate valve has a threaded stem that rises visibly when the valve is open and is flush (retracted) when closed. This visible indicator allows fire safety inspectors, sprinkler maintenance teams, and fire brigades to confirm the valve position from a distance without opening any covers. NFPA 13 requires OS&Y gate valves (or equivalent listed valves with position indication) for all supply isolation points on automatic fire sprinkler systems.
What actuators work with HVAC butterfly valves for BMS control?
HVAC butterfly valves are typically fitted with electric actuators (24V AC/DC or 230V AC) with ISO 5211 flanged mounting. Common actuator interfaces for BMS: on/off (2-wire), modulating (0–10V or 4–20mA analogue signal for proportional control), and floating (3-wire: open/close/stop). For AHU coil control and variable flow systems, modulating actuators with position feedback (0–10V output) are standard. Vajra can supply butterfly valves with pre-mounted actuators calibrated and tested as a package.
What valve types are used for chilled water balancing in HVAC systems?
Chilled water balancing uses several valve types: manual balancing valves (globe-pattern with measurement ports, e.g., Crane or IMI TA type) for commissioning; automatic pressure-independent balancing and control valves (PICV) that combine balancing and control in one valve; and two-way modulating control valves (globe-type) on AHU and FCU coils. For large-diameter headers (DN 100 and above), motorised butterfly valves with modulating actuators are used. Vajra supplies globe valves, butterfly valves, and ball valves suitable for chilled water balancing and control.

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Key Standards

ASME B16.34
EN 12266 (Industrial valve testing)
UL Listed (Fire suppression valves)
FM Approval (Fire protection)
IS 778 / IS 780 (Indian plumbing valves)
NFPA 13 (Sprinkler systems)
BS 1010 / EN 12614 (Bronze valves)

Products for This Application

Ball ValvesGate ValvesGlobe ValvesButterfly Valves

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