Gv. internal - external, 3/8" FM

Product detailed description

This ball valve is commonly used in residential and commercial plumbing systems for the control of water flow. It is suitable for both supply lines and circulation systems where reliable shut-off is required. The internal-external lever design allows for easy operation even in tight spaces. The valve’s construction ensures compatibility with a wide range of pipe fittings and systems.

It is often found in heating, sanitation and irrigation systems, where it serves as a durable and efficient solution for isolating sections of the system during maintenance or repairs. The full-bore design ensures minimal pressure loss and smooth fluid passage. The nickel-plated brass body provides resistance to corrosion and wear, making it ideal for long-term use in aggressive environments.

Technical parameters

Installation and connection

The valve is connected using internal and external threads of 3/8 inch FM. Prior to installation, ensure that the pipe threads are clean and free from burrs. Apply a suitable sealing compound or tape to the male thread to prevent leaks. Align the valve correctly with the pipeline and tighten securely using an appropriate wrench. Avoid over-tightening, which can damage the sealing surfaces or deform the valve body. Common installation errors include incorrect thread orientation, insufficient sealing material and misalignment with the flow direction.

Compatibility and accessories

This valve is compatible with standard copper, steel and plastic pipes that use 3/8 inch FM connections. For optimal performance, it should be used with pipe fittings and components that also meet PN 50 specifications. When installing in a larger system, ensure that adjacent components, such as filters or pressure regulators, are sized and rated appropriately. No additional accessories are typically required for basic installation.

Technical background for designers

The valve operates by rotating a ball with a central hole, allowing or blocking the flow of water. The full-bore design minimises flow restriction and pressure drop. The PN 50 rating means the valve can handle sustained pressures up to 50 bar at room temperature. The operating temperature range from -20°C to +120°C makes it suitable for both cold and hot water systems. Proper integration into the system requires consideration of the overall pressure and temperature profile to avoid exceeding the valve’s limits.

Service and operation

Regular visual inspections are recommended to check for signs of leakage, corrosion or mechanical damage. Ensure that the lever moves smoothly without resistance. If stiffness occurs, disassemble the valve and clean the internal components. Reapply lubricant if necessary. No scheduled service intervals are specified in the technical documentation. Avoid operating the valve partially open for extended periods, as this can cause wear on the sealing surfaces.

Frequently asked questions

Can this valve be used in a hot water system?
Yes, the valve is suitable for hot water systems as it operates up to +120°C. Ensure that the entire system components are rated for similar temperatures.

Is this valve compatible with copper piping?
Yes, the valve is compatible with copper piping provided the connections are made using 3/8 inch FM threads and proper sealing methods are applied.

Can this valve be used in a pressurised system?
Yes, the PN 50 rating allows use in pressurised systems up to 50 bar at standard temperature. Check the system’s operating pressure and ensure it does not exceed the valve’s rating.

What sealing method is recommended for installation?
A sealing compound or PTFE tape should be applied to the male thread to ensure a leak-free connection. Avoid over-tightening the valve during installation to prevent damage to the sealing surfaces.