Comap thermostatic valve set PL809W5429 — 1/2" thermostatic valve, W5 actuator, 1/2" return valve

Comap thermostatic valve set PL809W5429 includes a 1/2" thermostatic valve, a W5 temperature actuator head and a 1/2" return (check) valve, designed for closed hot-water heating circuits. The set provides regulated flow to radiators while maintaining the selected room temperature through the thermostatic actuator. It is intended for installation on residential and light-commercial radiators where compact, reliable temperature control and backflow prevention are required.

Advantages

The integrated combination of thermostatic valve, W5 actuator and return valve delivers precise temperature control, simplified installation and protection against reverse flow. The W5 actuator responds to temperature settings to modulate flow automatically, reducing temperature fluctuations and improving heating comfort. The return valve prevents unwanted backflow, ensuring stable operation of the heating circuit and preventing circulation issues.

Suitable for

• Domestic radiators in apartments and houses
• Small commercial premises with hot-water radiator systems
• Replacement or upgrade of existing radiator valves for improved temperature control

Key specifications

• Valve connection size: 1/2"
• Includes thermostatic valve, W5 temperature actuator head and return (check) valve
• Application: closed hot-water heating circuits
• Functionality: flow regulation, automatic temperature control, backflow prevention
• Compatibility: designed for standard radiator connections with 1/2" fittings

How to use

Install the thermostatic valve set in place of the existing radiator valve or on a new radiator using the standard 1/2" connections. Mount the thermostatic valve body to the radiator inlet, fit the W5 actuator head to the valve spindle and connect the return (check) valve in the return line as required by the system layout. Set the desired temperature on the W5 actuator; the actuator will regulate flow automatically to maintain that temperature. Commission the radiator by bleeding air, checking for leaks and ensuring the heating circuit pressure and flow comply with system recommendations.

Usage recommendations

Use the valve set in systems with compatible 1/2" fittings and within the operating limits specified by the heating system manufacturer. During installation, follow local plumbing and heating codes and use appropriate sealing and torque values to avoid leaks. Periodically check the actuator for correct movement and the return valve for free operation; service or replace components if the system shows uneven heating or leakage.