Radiator valve Herz 1/2" straight (ligeløbende) model 1552321, 1/2 inch connection

Herz 1/2" straight radiator valve (model 1552321) is a compact plumbing fitting designed for connecting and regulating the flow of hot water to radiators in central heating systems. The valve features a 1/2-inch threaded straight connection and is intended for manual adjustment of flow, making it suitable for standard radiator installations that require a simple, reliable shut-off and flow control solution.

Advantages

The Herz 1/2" straight radiator valve offers straightforward manual control of radiator flow with a compact straight design that fits tight installation spaces. Constructed for use in hot water central heating systems, it provides stable and predictable operation for balancing room temperatures and isolating radiators during maintenance. Its standardized connection size ensures compatibility with common radiator fittings.

Suitable for

• Domestic and commercial radiators with 1/2" threaded inlet
• Replacement of existing straight radiator valves
• New radiator installations in compact or confined spaces
• Systems requiring manual flow control and isolation for maintenance

When it may not be suitable

This straight manual valve may not be suitable where thermostatic control is required; thermostatic radiator valves or motorized actuators are needed if automatic temperature regulation is desired. It also may not be the right choice for systems with non-standard or larger threaded connections without adapters.

Key specifications

• Connection type: straight threaded connection
• Connection size: 1/2 inch (threaded)
• Function: manual flow control and isolation for radiators
• Application: hot water central heating systems
• Design: compact straight valve body suitable for confined installs

How to use

Install the valve onto the radiator inlet by matching the 1/2" threaded connection and ensuring a tight, leak-free seal with appropriate sealing material (thread tape or joint compound) where required. Use the valve spindle or handle to open or close the flow to the radiator and adjust flow rate manually to balance heating. For maintenance, fully close the valve to isolate the radiator before draining or disconnecting. Installation and adjustment should follow local plumbing codes and best practices; consider using a qualified installer if unsure.

What to consider before purchase

• Confirm radiator inlet thread size is 1/2" to ensure compatibility
• Decide whether manual control meets your needs or if a thermostatic valve is preferred
• Check available space for a straight valve installation versus angled alternatives
• Ensure materials and pressure/temperature ratings match your heating system requirements

Usage recommendations

For reliable performance, install the valve with correct sealing and ensure regular inspection for leaks. Use manual adjustments to balance rooms and fully close the valve before any radiator servicing. Where automatic temperature control is required, pair the radiator with a thermostatic head instead of a manual straight valve.