EnglishChiller Inlet and Outlet
Butterfly ValveProvides compact isolation at chiller inlet and outlet connections, especially on larger-diameter chilled water lines.
HVAC Cooling Valves for Chilled Water and Condenser Water Systems
Union Valve supplies industrial isolation, backflow-prevention and straining solutions for commercial and industrial HVAC water systems, including butterfly valves, gate valves, check valves and Y strainers for chilled water loops, condenser water circuits, cooling towers and data center cooling plants.
✓ Solutions for equipment isolation, backflow prevention and debris removal
✓ Configurable materials, pressure ratings, connection types and operating options
✓ Support for applicable international standards and project-specific requirements
HVAC COOLING APPLICATIONS
Where Valves Are Used in an HVAC Cooling System
Valves and pipeline accessories are installed throughout chilled water and condenser water circuits to isolate equipment, prevent reverse flow, remove debris and support system maintenance. Select a numbered location to view the products commonly used at each point. Tap a numbered point to view the recommended products.
Pump Suction
Y Strainer and Butterfly ValveA Y strainer removes debris before the pump while a butterfly valve provides isolation for inspection and maintenance.
Pump Discharge
Check Valve and Butterfly ValveA check valve helps prevent reverse flow when the pump stops while a butterfly valve provides downstream isolation.
Supply and Return Mains
Butterfly Valve or Gate ValveButterfly and gate valves isolate main piping, system zones and equipment sections during maintenance.
Condenser Water Circuit
Butterfly Valve and Check ValveButterfly valves isolate condenser water piping while check valves help prevent reverse flow at pump discharge points.
Cooling Tower Connections
Butterfly ValveButterfly valves provide isolation at cooling tower inlet and outlet connections.
Equipment Bypass
Butterfly Valve or Gate ValveIsolation valves separate bypass piping during commissioning, inspection and maintenance.
Drain and Maintenance Branches
Project-Specific Isolation ValveSelection depends on branch diameter, pressure, drainage requirements and the project piping specification.
Recommended Products for HVAC Cooling Systems
Butterfly Valves
Butterfly valves provide compact isolation for chilled water and condenser water pipelines. They are commonly installed on medium- and large-diameter mains, chiller connections, pump isolation points and cooling tower lines.
Connections: Wafer · Lug · Double flanged
Designs: Concentric · Double eccentric
Operation: Manual · Electric · Pneumatic
Typical service: Chiller connections · Main pipelines · Cooling tower lines
Resilient Seated Gate Valves
Resilient seated gate valves provide full-open or full-closed isolation where a full-bore flow path and low resistance in the open position are required. They are suitable for selected HVAC mains, equipment isolation points and buried water pipelines.
Standards: BS 5163 · EN 1074 · AWWA C509/C515
Options: NRS · OS&Y
Duty: Full-bore pipeline isolation
Selection: Pipe size · Pressure rating · Installation space · Operating method
Check Valves
Check valves are commonly installed on chilled water and condenser water pump discharge lines to prevent reverse flow when pumps stop or operating conditions change. The design should be selected according to flow velocity, closing response and water-hammer risk.
Types: Swing · Dual plate · Silent check
Duty: Pump discharge · Backflow prevention
Selection: Closing behavior · Flow velocity · Orientation · Available space
Typical service: Chilled water pumps · Condenser water pumps · Cooling tower circuits
Y Strainers
Y strainers remove debris from chilled water and condenser water before it reaches pumps, chillers, heat exchangers and other sensitive equipment. The strainer should be positioned to allow screen removal, cleaning and routine maintenance.
Duty: Debris removal · Equipment protection
Typical locations: Pump suction · Chiller inlet · Heat exchanger inlet
Selection: Screen opening · Allowable pressure drop · Line size · Cleaning access
Maintenance: Confirm screen removal space and blowdown arrangement
HVAC VALVE SELECTION
How to Select Valves for an HVAC Cooling Project
Use these seven steps to define the service conditions, materials, connections, operation and documentation required for your project.
Confirm the Fluid
Identify the fluid before selecting valve and sealing materials. For glycol mixtures, provide the glycol type and concentration.
Typical fluidsChilled water, condenser water, treated water and water-glycol mixtures
Information requiredWater treatment details, glycol type and glycol concentration
Define Temperature and Pressure
Confirm the full operating range rather than selecting a valve only from the normal system pressure.
ProvideDesign temperature, operating pressure and maximum differential pressure
Also confirmRequired pressure rating, pressure-test conditions and any project safety margin
Confirm Pipe Size and Connection
Specify the pipe size, mating connection and available installation length.
Pipe sizeDN or NPS
Connection optionsWafer, lug, double flanged and grooved
Installation checkFlange standard, face-to-face dimension and available space
Identify the Required Duty
Match the product type to its actual function and installation position in the HVAC water system.
IsolationButterfly valve or gate valve
Backflow preventionCheck valve
Debris removalY strainer
Check Material Compatibility
Body, disc, stem, seat and sealing materials must suit the fluid, temperature and expected operating conditions.
Body materialsCast iron, ductile iron, carbon steel and stainless steel
Seat optionsEPDM, NBR, FKM and PTFE
Available material combinations vary by valve type and size.
Confirm the Operation Method
Select an operating method that matches the valve size, installation position and required operating frequency.
Operation optionsLever, gearbox and confirmed electric or pneumatic actuator configurations
Installation checkOperator clearance, insulation thickness, extended stem or neck and maintenance access
Match Standards and Documentation
Confirm the applicable product, testing and dimensional standards before production.
Applicable standardsAPI 609, API 598, MSS SP-67, EN 558, AWWA C504, BS 5163 and EN 1074, depending on valve type
DocumentationInspection records, test reports and available product-specific certification
Certifications and approvals vary by product and destination market.
NEED SELECTION SUPPORT?
Share Your HVAC Valve Requirements
Send us the application, fluid, DN/NPS, pressure rating, connection type and applicable project standard. Our team will review the information and recommend a suitable valve configuration.
- Chilled water or condenser water application
- Pipe size, pressure and connection type
- Required materials and operation method
- Project standards and documentation
Ready to discuss your project?
Send a valve schedule or project specification through our contact page.
Request HVAC Valve SelectionRequest HVAC Cooling Valves Selection
Send your valve schedule, drawings or project requirements. Include the application, size, pressure rating, connection type, operating method and required approvals so we can review the appropriate configuration.
HVAC Cooling Valves FAQs
Are butterfly valves suitable for chilled water isolation?
Yes. Butterfly valves are widely used for isolating medium- and large-diameter chilled water pipelines because they are compact and create relatively low pressure loss.
Which check valve is suitable for an HVAC pump discharge?
Silent check valves and dual plate check valves are common choices. Final selection depends on pipe size, flow velocity, installation orientation and water-hammer risk.
What seat material is commonly used for HVAC water valves?
EPDM is commonly used for chilled and condenser water. The seat material should always be confirmed against the operating temperature, water treatment chemicals and glycol concentration.
What information is required for HVAC valve selection?
Please provide the valve function, size, pressure, temperature, fluid, connection type, operating method, required materials, quantity and applicable standards.