Straight fitting - pipe/internal thread - 25x3/4"; PE/external thread FIV.07710

Product detailed description

This straight fitting is used in plumbing and heating systems to connect polyethylene (PE) pipe to an external thread. It is commonly installed in residential and commercial buildings for water supply, heating circuits, and other applications where a secure and leak-free connection is required. The fitting is designed for use in systems operating within a temperature range of -20 to +90 °C and with a nominal pressure of PN 16. It is particularly suited for systems where PE piping is connected to metal components or fixtures with external threading. The brass construction and sealing elements ensure durability and resistance to corrosion in wet and humid environments.

Installers and technicians working in heating and plumbing applications will find this fitting suitable for both new installations and system repairs. It is often used in conjunction with PE pipes of 25 mm diameter and fittings with a 3/4 inch external thread. The fitting is designed to be installed in systems where flexibility and ease of assembly are required, such as in underfloor heating, domestic hot and cold water systems, and irrigation systems. The connection method involves securing the PE pipe with a clamp ring and O-ring to ensure a tight seal and prevent leakage.

Technical parameters

Installation and connection

Installation involves connecting the PE pipe to the external thread using the clamp ring and O-ring. The PE pipe should be cut cleanly and inserted into the fitting until it reaches the stop. The clamp ring is then tightened to secure the pipe in place and create a watertight seal. The external thread is typically connected to a valve, pipe, or fitting using standard tightening tools. It is important to ensure the O-ring is properly seated and not damaged during installation to prevent leaks. Common installation mistakes include over-tightening the clamp ring, which can damage the PE pipe or the fitting, and using incorrect tools that may deform the brass body or strip the thread.

Compatibility and accessories

This fitting is compatible with PE pipes of 25 mm diameter and components with a 3/4 inch external thread. It is typically used with standard PE piping systems and requires no additional accessories for basic installation. However, for larger systems or where multiple connections are required, additional fittings and valves may be needed. No related products are available for this model.

Technical background for designers

The fitting operates by securing the PE pipe with a clamp ring and O-ring, which compresses against the pipe and the brass body to create a seal. The brass body (CW617N) provides strength and resistance to corrosion, while the clamp ring (CW614N) ensures a secure fit. The NBR O-ring provides a flexible seal that adapts to minor imperfections in the pipe surface. The PN 16 rating ensures the fitting can handle typical pressures in domestic and commercial systems. The operating temperature range allows for use in both cold and hot water applications. The material properties of the brass and rubber components affect the service life and efficiency of the fitting, particularly in systems with high water hardness or fluctuating temperatures.

Service and operation

Regular inspection of the fitting is recommended to ensure the seal remains intact and there are no signs of leakage or wear. The O-ring should be checked for cracks or deformation, and the clamp ring should be verified for tightness. No specific service intervals are provided in the technical data. If a leak is detected, the fitting should be disassembled, the O-ring replaced if necessary, and the connection re-tightened. In systems with high water hardness, periodic cleaning of the fitting may be required to prevent mineral buildup that could affect the seal.

Frequently asked questions

Can this fitting be used for connecting PE pipe to a metal valve with an external thread?
Yes, the fitting is designed for connecting PE pipe to an external thread, making it suitable for use with metal valves that have a 3/4 inch external thread.

Is the fitting suitable for use in hot water systems?
Yes, the operating temperature range includes up to +90 °C, which makes it suitable for hot water systems such as domestic hot water supply and underfloor heating.

Can the fitting be used in systems with a pressure higher than PN 16?
No, the nominal pressure rating of PN 16 indicates the maximum pressure the fitting is designed to handle. Exceeding this pressure could result in failure of the fitting or the seal.

Is the O-ring replaceable after installation?
Yes, the O-ring can be replaced if it becomes damaged or worn. The fitting should be disassembled, the old O-ring removed, and a new one installed before re-tightening the clamp ring.