W6 Spring-loaded Check Valve - Stainless Steel - DN 20; L=19mm BRA.W6.626

Product detailed description

Spring-loaded check valves are essential components in systems where unidirectional flow control is required to prevent reverse flow. They are commonly used in heating, ventilation and air conditioning (HVAC) systems, water supply networks, pumping stations and chemical processing plants. These valves ensure reliable sealing when the flow stops or reverses, making them suitable for both high-pressure and low-pressure applications. The compact design allows installation in tight spaces and supports various orientations during mounting.

Correct selection and installation of such valves are crucial for system integrity. They are often integrated into closed-loop systems where media such as water, glycol mixtures, oils and hydrocarbons are transported. The operating conditions include variable temperatures and pressures, which must be considered during the specification process. The valve must also be compatible with the surrounding piping and fittings to ensure leak-free operation over time.

Technical parameters

Material: body	Stainless steel
Nominal diameter	DN 20
Rated pressure	PN 16/PN 10
Weight	0.201 kg
Code	W6626020
Brand	IVAR

The nominal diameter (DN 20) determines the size of the pipe connections and the flow capacity of the valve. The rated pressure (PN 16/PN 10) defines the maximum allowable pressure under normal operating conditions. These values are essential for ensuring the valve meets the hydraulic requirements of the system and can withstand the expected load without failure. The material of the body (stainless steel) is selected for its resistance to corrosion and mechanical stress, making it suitable for aggressive media and high-temperature environments.

Installation and connection

The valve is designed for flange-to-flange mounting between two pipe flanges. The connection size corresponds to DN 20, and the flange standard must be verified to match the system’s specifications. Prior to installation, the flange faces should be cleaned to remove debris and ensure proper contact with the sealing surfaces. The valve can be mounted in any orientation, but the direction of flow must align with the arrow marked on the body to prevent incorrect operation. Common installation errors include misalignment of flanges, over-tightening of bolts and incorrect orientation of the valve. These issues can lead to leakage, increased wear and reduced service life. To avoid these problems, installers should follow the manufacturer’s guidelines and verify the alignment and torque settings for the bolts.

Compatibility and accessories

This valve is compatible with stainless steel and carbon steel piping systems that meet the flange standards EN 1092-1. It is intended for use with media such as water, glycol solutions, oils and hydrocarbons. For systems requiring additional control or monitoring, pressure gauges and flow meters can be installed upstream or downstream of the valve. No specific accessories are required for standard installation, but the system’s overall design must account for thermal expansion and vibration to prevent stress on the valve body.

Technical background for designers

The spring-loaded check valve operates by allowing forward flow through the valve while the spring holds the disc closed against reverse flow. When the flow stops or reverses, the spring force seals the valve to prevent backflow. The materials used—stainless steel for the body, disc and partition, and a spring made of AISI 316—ensure resistance to corrosion and high temperatures. The valve is suitable for media with up to 50% glycol content, making it applicable in systems where antifreeze properties are required. The integration of the valve into the system must consider the pressure drop across the valve and the required minimum backpressure to maintain sealing. The operating temperature range (-20°C to +350°C) allows the valve to function in both cold and hot environments. The longevity and efficiency of the valve depend on the quality of the installation, the cleanliness of the media and the absence of excessive vibration or pulsation in the system.

Service and operation

The valve requires minimal maintenance due to its robust design and high-quality materials. Regular visual inspections should be performed to check for signs of wear, corrosion or leakage. The sealing surfaces should remain free of debris to ensure proper closure. No scheduled service intervals are specified, but the valve should be inspected whenever system performance indicates potential issues. In case of suspected malfunction, the valve should be removed and checked for damage or contamination.

Frequently asked questions

Can the valve be installed in vertical pipelines?
Yes, the valve can be mounted in any orientation as long as the flow direction indicated on the body is maintained.

Is the valve suitable for use with glycol-based fluids?
Yes, it is approved for use with water containing up to 50% glycol, making it suitable for antifreeze applications.

What is the minimum backpressure required for sealing?
The valve requires a minimum backpressure of 0.1 bar to maintain a sealed condition when the flow is reversed.

Can this valve be used in potable water systems?
Yes, the valve has an ATEST certification for potable water use, ensuring compliance with relevant standards for drinking water applications.