Flange Butterfly Valve with Soft Sealing - Series 20.900 - DN 80; L=180mm BRA.20.900

Product detailed description

Flange butterfly valves are commonly used in commercial and industrial buildings for regulating the flow of water in heating, ventilation and air conditioning (HVAC) systems. They are also suitable for water supply and drainage applications. Installers and technicians working on these systems need reliable components that can handle varying pressure and temperature conditions. This model is designed for use in systems operating within a temperature range of -10°C to +85°C and is not suitable for steam or media containing oils or hydrocarbons.

Correct installation and selection of the valve are essential to ensure system efficiency and longevity. The valve must be integrated into a system that operates within its specified pressure and temperature limits. It is typically used in closed-loop systems where flow control is required without the need for frequent manual adjustment.

Technical parameters

Material	body - ductile iron GJS 500-7
Nominal diameter	DN 80
Nominal pressure	PN 16
Weight	16.4 kg
Code	20900080
Brand	IVAR

The technical parameters define the valve’s suitability for specific applications. The nominal diameter (DN 80) determines the size of the pipe it can connect to, while the nominal pressure (PN 16) indicates the maximum pressure it can handle. The body material (ductile iron GJS 500-7) ensures durability and resistance to mechanical stress. These parameters are essential for correct sizing and system compatibility.

Installation and connection

The valve is installed between two flanged pipe sections. The flanges must be aligned and tightened evenly to prevent leakage. The connection size is DN 80, and the flange standard is EN 1092-1. Before tightening, ensure that the sealing surfaces are clean and free from debris. Common installation errors include uneven tightening of bolts and incorrect alignment, which can cause stress on the valve body and lead to premature failure. Always follow the manufacturer's instructions for torque values and installation sequence.

Compatibility and accessories

This valve is compatible with standard flanged piping systems operating within the specified pressure and temperature range. It is typically used with ductile iron or steel pipes. No additional accessories are required for standard installation. Ensure that the system includes appropriate supports and expansion joints to accommodate thermal movement and reduce stress on the valve.

Technical background for designers

The valve operates by rotating a disc within the body to control the flow. The soft sealing mechanism ensures a tight shut-off when the disc is closed. The body is made of ductile iron GJS 500-7, which offers high tensile strength and impact resistance. The stem is made of AISI 420 stainless steel, providing resistance to corrosion and wear. The disc is coated with EPDM, which is suitable for water and non-aggressive media. The service life and efficiency depend on the operating conditions, including temperature, pressure and media type. Avoid using the valve in systems with aggressive or abrasive media.

Service and operation

The valve requires minimal maintenance under normal operating conditions. Regular inspections should include checking for leaks, verifying the alignment of the flanges and ensuring that the operating mechanism moves freely. No scheduled service intervals are specified. If the valve is to be removed for maintenance, follow standard procedures for disconnecting flanged components. Avoid using excessive force when operating the valve to prevent damage to the stem or sealing surfaces.

Frequently asked questions

Can the valve be used in steam systems?
No, the valve is not suitable for steam or media containing oils or hydrocarbons. The sealing material and body material are not designed for such conditions.

What is the maximum operating temperature?
The valve is suitable for operation between -10°C and +85°C. Exceeding this range may affect the sealing performance and structural integrity.

Is the valve suitable for use in drinking water systems?
Yes, provided the system operates within the specified pressure and temperature limits. The materials used are compatible with water and do not introduce contaminants.

Can the valve be used in reverse flow conditions?
Yes, the valve is symmetrical and can be installed in either direction. However, the flow direction should be consistent with the system design to ensure proper operation.