Thermostatic radiator valve Herz HERZ-TS-E 3/4 straight gravity

The Herz HERZ-TS-E 3/4 straight gravity thermostatic radiator valve is a mechanical flow-control device engineered for direct connection to radiators with 3/4-inch fittings. It operates without external power, using a gravity or hydronic differential to regulate hot water flow to the radiator and maintain a set temperature. The valve is intended for installation on both residential and commercial heating systems where reliable, self-acting temperature control is required.

Advantages

The valve provides stable temperature regulation through a simple mechanical thermostatic element, eliminating the need for electrical power or control wiring. Its straight-body design offers compact installation and direct alignment with radiator inlet piping. The device is compatible with standard 3/4 connections and is designed for durable operation in closed heating circuits. The gravity-operated function ensures continued regulation even when pump speeds vary or in gravity-fed systems.

Suitable for

• Domestic radiators in central heating systems
• Commercial radiator installations requiring self-acting temperature control
• Gravity-fed or low-head hydronic heating circuits
• Retrofit projects where a straight valve body and 3/4 connection are needed

Key specifications

• Connection size: 3/4-inch straight-body fitting suitable for radiator inlets
• Operation type: thermostatic, gravity-operated (hydronic differential driven)
• Control method: mechanical thermostatic element for temperature regulation without electrical input
• Application: intended for use in closed hot-water heating systems (radiators)
• Installation orientation: straight inline mounting on radiator inlet pipework

How to use

Install the valve inline at the radiator inlet using compatible 3/4-inch fittings and ensure correct orientation for straight-body mounting. Set the thermostatic head to the desired room temperature according to the head's scale, allowing the mechanical element to modulate flow automatically. Commission the heating system, purge air from the radiator, and check for leaks at connections. The valve will regulate flow based on the temperature of the radiator or surrounding air and does not require electrical connection or external control input.

Usage recommendations

For reliable performance, use with properly sized radiators and ensure system cleanliness to avoid debris affecting the valve spindle and thermostatic element. During commissioning, balance the heating circuit as required and verify operation across the expected temperature range. If used in gravity-fed systems, confirm that flow rates are within the valve's effective operating range. Periodic inspection for leaks and correct setting of the thermostatic head is recommended.