Ball Valve UN model H/ZK-72-020 3/4" straight with butterfly handle, normally closed

UN model H/ZK-72-020 is a straight 3/4" ball valve with a butterfly-style handle and a normally closed configuration. The valve is designed for manual on/off control of fluid flow in pipelines and is suitable for water, heating systems and general industrial applications. Its metal construction provides a reliable shut-off and straightforward installation in systems that require a compact, manually operated isolation valve.

Advantages

The valve offers a compact design with a butterfly handle that enables quick manual operation and clear visual position indication. Metal construction ensures mechanical strength and improved sealing performance compared to non-metallic alternatives. The straight body design simplifies inline installation and reduces flow disturbances. The normally closed configuration is suitable where default shut-off is required for safety or maintenance.

Suitable for

• Domestic and commercial water supply lines
• Heating and radiator systems
• General industrial piping for non-corrosive fluids
• Service and maintenance isolation where a normally closed valve is preferred

Key specifications

• Nominal size: 3/4"
• Configuration: straight body
• Operation: manual butterfly handle
• Default state: normally closed (N/CZ)
• Material: metal body and ball (metal construction)
• Function: on/off shut-off valve

How to use

Install the valve inline with the pipeline following the flow direction indicated by the system design. Secure connections using appropriate fittings and ensure proper sealing at pipe joints. Operate the butterfly handle to open or close the valve: rotate the handle 90° to change between fully open and fully closed positions. Verify that the valve is fully seated in the closed position when isolation is required and periodically cycle the valve to prevent sticking in long-term installations.

Usage recommendations

For reliable performance, use this valve in systems carrying water, heating fluids or other non-corrosive media compatible with metal components. Avoid exposure to highly corrosive chemicals and extreme temperatures outside the valve's material limits. During installation, ensure correct alignment and proper torque on fittings; perform a pressure test after installation to check for leaks. Regular inspection and occasional operation of the valve will help maintain sealing performance and prevent buildup or sticking.