Overview
The Atkomatic HS500 is a pilot-operated solenoid valve engineered for steam and hot-water applications in industrial process control and facility maintenance. With a 3/4″ NPT inlet and 1″ NPT outlet, this valve delivers full-port performance ideal for heating, sterilization, and thermal equipment where responsive control and durability matter.
Key Features
- Pilot-operated design: Provides smooth, efficient flow control independent of system flow rate with just 5 PSIG minimum pressure differential.
- Full-port bronze construction: Naval M bronze body resists corrosion in steam and hot-water environments; rated for continuous duty.
- Metal-to-metal pilot seat with Teflon piston: Ensures tight shutoff and long service life without stem packing.
- Wide operating range: 5–125 PSIG at up to 352°F (178°C) maximum temperature.
- Easy maintenance: Solenoid coil replaces without depressurizing the valve; internal parts serviceable in-line.
- Hermetically-sealed coil: Continuous-duty design; multiple voltage options available (24 VDC/VAC through 460 VAC).
Technical Specifications
- Inlet Port: 3/4″ NPT
- Outlet Port: 1″ NPT
- Operating Pressure: 5–125 PSIG (0.35–8.6 bar)
- Maximum Temperature: 352°F (178°C)
- Minimum Pressure Differential: 5 PSIG
- Body Material: Naval M Bronze
- Seat Material: Teflon piston, metal-to-metal pilot
- Body Seals: Teflon O-rings
- Flow Coefficient (Cv): 1.4–21 (size-dependent)
- Valve Type: Normally-closed, solenoid-operated pilot-piston
- Coil Duty: Continuous
- Connections: NPT (standard); BSP available
- Fluid Media: Steam, hot water, compressed air
- Dimensions (L × W × H): 5¼” × 4″ × 3¾”
- Weight: 7.5 lbs
- Manufacturer: Atkomatic (Circle Seal Controls, Inc.)
Typical Applications
The HS500 is widely used in:
- Steam sterilization systems (medical, laboratory, pharmaceutical)
- Industrial heating and process-steam distribution
- Hot-water space-heating and domestic hot-water control
- Thermal equipment requiring responsive, fail-safe valve operation
- Institutional and facility management systems with solenoid actuation
Compatibility & Replacements
Compatible With
- Standard industrial steam and hot-water systems (5–125 PSIG working range)
- Pilot-operated solenoid valve control circuits (24 VDC, 24–460 VAC coils available)
- NPT-threaded pipe and fittings (standard industrial compatibility)
- Building automation and process-control PLCs with discrete solenoid outputs
- Manual override / three-way dump valves for system venting
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The HS500 supersedes earlier Atkomatic steam valve designs within the same pressure and temperature class. Consult manufacturer documentation for exact cross-reference with competing brands (Asco, Watts, etc.).
Works With
- Industrial solenoid-valve controller cards and timer modules
- Steam-trap and condensate-return systems
- Pressure-reducing regulators and check valves (upstream/downstream)
- Flow orifice plates and metering devices
- Standard 24 VDC and 115–460 VAC control wiring
- Manual-opening devices for system priming and emergency venting
