WAFER J9 - disc stainless steel; EPDM - DN 300; L=78mm BRA.J9.120

Product detailed description

This stainless steel disc shut-off valve is commonly used in central heating systems, ventilation installations and water supply systems in commercial and industrial buildings. It is typically installed in closed-loop systems where controlled flow shut-off is required. The valve is designed for use with water, air and other non-corrosive fluids, and is not suitable for steam or oily or hydrocarbon-based media. The compact flange-to-flange design allows for efficient integration into existing flanged piping systems without the need for additional support structures.

The WAFER J9 DN 300 is frequently used in HVAC applications, including boiler circuits, pump stations and heat exchanger systems. It is particularly suited for systems requiring frequent manual shut-off and isolation of sections for maintenance. The valve’s EPDM sealing material ensures a tight closure, while the stainless steel disc provides resistance to corrosion and wear in wet environments. The valve is not certified for potable water applications and should not be used in systems where drinking water is transported.

Technical parameters

Material	body - ductile iron GJS 400-15
Nominal diameter	DN 300
Nominal pressure	PN 16/PN10
Weight	34.8 kg
Code	J9.120.300
Brand	IVAR

The valve is rated for operating pressures up to PN 16 and PN 10, making it suitable for medium-pressure applications in heating and water systems. The nominal diameter of DN 300 ensures compatibility with larger pipe sizes typically found in industrial and commercial installations. The operating temperature range of -10°C to +120°C allows for use in both cold and hot water systems. These parameters are essential for correct sizing and system integration, ensuring the valve meets the hydraulic and thermal requirements of the installation.

Installation and connection

The WAFER J9 DN 300 is installed between two flanges according to EN 1092-1 standards. The flange connection must be verified for PN 16, PN 10 or PN 6 compatibility. The valve should be aligned with the pipeline axis to prevent uneven stress on the sealing components. Prior to installation, the flange surfaces must be clean and free of debris to ensure a proper seal. The valve should not be used in systems with pulsating flow or high vibration, as this may affect the integrity of the EPDM seal. Common installation errors include misalignment of the flanges and over-tightening of the bolts, which can lead to premature wear or leakage.

Compatibility and accessories

The valve is compatible with standard flanged piping systems and is typically used in conjunction with other flanged components such as pumps, heat exchangers and expansion vessels. No additional accessories are required for standard installation, but it is important to ensure that the flange dimensions and bolt patterns match the system requirements. The valve is not suitable for use with steam or oily media and should not be combined with components designed for such applications.

Technical background for designers

The WAFER J9 DN 300 operates as a manual shut-off valve, relying on a stainless steel disc and EPDM sealing material to block or allow flow. The ductile iron body (GJS 400-15) provides high mechanical strength and resistance to deformation under pressure. The EPDM seal is suitable for water-based media and provides a reliable closure within the specified temperature range. The valve is designed for integration into systems operating at medium pressure and temperature, and its performance is influenced by the quality of the flange connection and the cleanliness of the installation environment. The valve is not suitable for applications involving aggressive or abrasive media due to the limitations of the EPDM sealing material.

Service and operation

The valve requires minimal maintenance under normal operating conditions. Regular visual inspections should be carried out to check for signs of leakage or corrosion. The EPDM seal should be inspected for wear or degradation, particularly in systems operating at the upper end of the temperature range. The valve should be operated manually using the locking lever, and excessive force should be avoided to prevent damage to the sealing components. No specific service intervals are provided in the technical data, but any signs of malfunction should prompt immediate inspection and, if necessary, replacement of the valve.

Frequently asked questions

Can the WAFER J9 DN 300 be used in steam systems?
No, the valve is not suitable for steam applications due to the limitations of the EPDM sealing material and the absence of a certification for high-temperature steam.

Is the EPDM seal compatible with hot water systems?
Yes, the EPDM seal is suitable for hot water systems operating up to +120°C, as specified in the technical data.

Can the valve be used in systems with hydrocarbon-based fluids?
No, the valve is not suitable for use with hydrocarbon-based fluids or oily media, as these can degrade the EPDM sealing material and compromise the integrity of the closure.

What is the maximum operating pressure for the WAFER J9 DN 300?
The valve is rated for operating pressures up to PN 16 and PN 10, making it suitable for medium-pressure applications in heating and water systems.