THRV Radiator Valves


  • Fast acting modulating control of space temperature.
  • Snap action mechanism for ease of installation.
  • EPDM rubber valve disc.
  • Designed for Comfort, Efficiency and Durability.
  • Optional Thermostat Guards for theft/tampering protection.
  • Conforms to ASHRAE / ANSI Standard 102-1983


Barnes & Jones THRV Series thermostatic valves and actuators provide efficient room temperature control in hydronic and steam heating applications.

Series THRV valves regulate the flow of hot water or steam through radiators,
baseboard and convectors in hot water and low-pressure steam heating systems.

The thermostatic valve operator consists of a standard vapor charged bellows and
a dial control that is set to the position equal to the desired temperature.

As temperature declines, the liquid sensing element contracts, expanding the integral bellows upward into the sealed liquid chamber. The overload spring and pushrod are also moved upward by the valve stem/return spring. The attached valve plug opens the valve to flow and with a rising temperature, the reverse occurs.



THRV Technical Specifications

Hydronic Hot Water Systems

Max. Temp: 250° F
Max. Static Pressure: 45 PSIG
Max. Test Pressure: 232 PSIG
Max. Differential Pressure (water): 20 PSIG
Max. Sensor Temp: 140° F
Adjustable Temp. Range: 45°- 86° F

Two Pipe Low Pressure Steam

Max. Temp: 250° F
Max. Test Pressure: 232 PSIG
Max. Steam Pressure: 15 PSIG
Max. Sensor Temp: 140° F (Adjustable)
Adjustable Temp. Range: 45°- 86° F

General: Furnish and install, as shown on the drawings, specifications and schedules, Barnes & Jones Thermostatic Valves with self-contained liquid filled actuators for space temperature control of hydronic or steam heating systems.
Operating Characteristics: Valves shall be available in sizes 1/2”, 3/4”, 1” and 1-1/4” (NPT) in straight, angle, reverse angle, and double patterns with double O-ring gland , union nut seat or threaded outlet tailpiece and female pipe thread inlets. Actuators shall be self-contains and shall be available in attached, remote bulb, wall and wall mounted with dual capillary styles. Actuators may have concealed set point/limit lock feature and set point memory disc. Optional thermostatic guards shall reinforce installation strength and prevent tampering.
Material Characteristics: All valves shall have forges bronze bodies, brass or stainless steel trim, stainless steel stems and EPDM seals.
Actuators shall have liquid filled elements with high impact white plastic covers.
Valve Sizing: All valves shall be sized to perform at specified flows with a maximum of 1.0 atmosphere pressure drop and at fluid temperatures below 232-250° F.
Manufacture: Complies with ISO 9001 Specifications. Sold by Barnes & Jones and authorized distributors.
Warranty: Valves and thermostats shall be free of material and workmanship defects for a period of 12-months from date of installation or 18-months from date of shipment, which ever comes first.