Universal check valve 3/4" full range

Product detailed description

Universal check valves are essential components in heating and plumbing systems where flow direction must be maintained to prevent backflow. They are commonly used in domestic hot water circuits, underfloor heating manifolds, and circulation loops in residential and commercial buildings. Installers encounter these valves when working on systems requiring non-return functionality to protect pumps, heat exchangers and storage vessels. The compact dimensions of 4.8x3.7 cm make this model suitable for tight spaces in mechanical rooms or behind wall panels.

The valve operates by allowing fluid to pass in one direction while closing automatically to prevent reverse flow. This ensures system integrity and protects downstream components from damage due to siphoning or unwanted flow reversal. Its design is particularly useful in systems with intermittent operation or multiple branches where flow isolation is necessary.

Technical parameters

EAN	8594013122511
Dimensions Height x Width x Depth (cm)	4.8x3.7
Code	PR_1609
Brand	ITAP SpA

These parameters are critical for proper sizing and selection. The pressure rating of PN15 indicates suitability for low-pressure systems. The opening pressure of 0.02 bar ensures minimal resistance to flow while maintaining function. The 40 bar test pressure confirms structural integrity under extreme conditions. Dimensions help determine space requirements during layout planning.

Installation and connection

To install the valve, ensure the system is depressurised and the flow direction aligns with the arrow marked on the body. The internal threading requires a matching external thread on the pipe. Use PTFE tape or approved thread sealant to prevent leaks. Check that the valve is fully seated against the pipework and that the sealing surface is undamaged. Common mistakes include incorrect orientation, which prevents normal operation, and over-tightening, which can distort the body or seating surface.

Compatibility and accessories

This valve is compatible with standard copper or steel pipes with 3/4 inch internal threading. For systems requiring additional control, it can be combined with thermostatic mixing valves or flow meters. When installing in new systems, ensure that adjacent components such as filters or strainers are correctly sized to avoid flow restriction. No specific accessories are required for basic installation.

Technical background for designers

The valve operates on a simple diaphragm or flap mechanism that opens under forward flow and closes under reverse flow. The OT 58 brass alloy provides good corrosion resistance and thermal stability up to 100°C. It is suitable for both potable and non-potable water applications. System designers should consider the valve’s minimal pressure drop and ensure that the overall system pressure does not exceed the PN15 rating. Longevity is influenced by water quality, presence of suspended solids and temperature fluctuations.

Service and operation

Routine inspection should include checking for signs of leakage around the threads and ensuring the valve moves freely without sticking. No scheduled maintenance intervals are specified in the brief. If the valve fails to close properly or shows signs of erosion, it should be replaced. Avoid using excessive force when turning the valve manually for testing.

Frequently asked questions

Can this valve be used in a closed-loop heating system?
Yes, provided the system operates within the PN15 pressure rating and the maximum temperature of 100°C.

Is it suitable for installation in a vertical position?
Yes, as long as the flow direction is aligned with the arrow on the body and the valve is supported to prevent sagging.

What is the minimum flow rate required for the valve to open?
There is no specified minimum flow rate; the valve opens based on pressure differential rather than volumetric flow.

Can it be used with chemical additives in the water?
It is suitable for water with standard additives, but compatibility with aggressive chemicals should be confirmed according to the manufacturer's technical data sheet.