Ratio Pressure Reducing Valve

The FUXEON® Ratio Pressure Reducing Valve is designed to reduce water pressure by using the difference between the effective pressure areas at both ends of the internal piston. As a type of pressure reducing valve, it creates a fixed proportional relationship between inlet and outlet pressure, making it suitable for metallurgy, petroleum, hydraulic systems, water pressure testing units, residential water supply, and high-rise building water supply systems.

Available pressure reduction ratios include 2:1, 3:1, 4:1, 3:2, and 5:2. The Valve can reduce both dynamic and static pressure and is suitable for water-based pipeline systems requiring proportional pressure control.

Working Principle

Pressure Balance

The Ratio Pressure Reducing Valve operates according to the force balance between different effective piston areas. The relationship can be expressed as P1 × S1 = P2 × S2, where P1 and P2 represent inlet and outlet pressure, while S1 and S2 represent the effective pressure areas at both ends of the piston.

Because the two effective areas are different, the inlet and outlet pressures maintain a predetermined proportional relationship. The outlet pressure changes with the inlet pressure rather than remaining completely constant.

Ratio Design

The pressure reduction ratio is determined by the matched internal valve core and cylinder liner. Different component dimensions create different effective pressure areas, allowing the valve to achieve ratios such as 2:1, 3:1, 4:1, 3:2, and 5:2.

The ratio is a structural design parameter and cannot be continuously adjusted during operation. A different pressure ratio requires a corresponding valve core and cylinder liner configuration. This operating principle makes the proportional pressure reducing valve suitable for systems requiring a fixed pressure relationship between different sections of a pipeline.

Product Comparison

Valve Types

Different pressure reducing valve designs are suitable for different system requirements. The following comparison can help purchasers select the appropriate pressure control method.

The Valve is suitable when the system requires a predetermined proportional pressure reduction instead of maintaining a completely constant downstream pressure.

Technical Data

Main Parameters

The nominal diameter should be selected according to pipeline size, flow rate, inlet pressure, pressure reduction ratio, and overall operating conditions.

Performance

The hydraulic performance of the Ratio Pressure Reducing Valve is affected by nominal diameter, inlet pressure, pressure ratio, flow rate, and pipeline resistance. As flow increases, pressure loss across the valve and pipeline may also change.

For accurate engineering selection, the nominal diameter, operating flow rate, inlet pressure range, and required outlet pressure should be considered together. Flow-pressure performance data should be based on the selected valve size and actual test conditions.

Applications

The Valve is suitable for metallurgy, petroleum-related systems, hydraulic systems, water pressure testing units, residential water supply systems, and high-rise buildings.

It can be used in pressure zoning applications where downstream pressure needs to maintain a proportional relationship with upstream pressure.

Quality Control

FUXEON® has multiple machining and production facilities and can manufacture several thousand pressure reducing valves per month.

Each finished valve undergoes a 2.4 MPa pressure test with a 5-minute holding period to check valve strength and sealing performance before delivery.

FUXEON® holds GB/T 19001-2016 / ISO 9001:2015, GB/T 24001-2016 / ISO 14001:2015, GB/T 45001-2020 / ISO 45001:2018, and GB/T 27922-2011 certifications.

Installation

Basic Requirements

The pipeline should be cleaned before installation, and a Y-type filter should be installed upstream to prevent debris from entering the valve. Gate valves or butterfly valves can be installed before and after the valve for easier maintenance.

For systems requiring continuous water supply, two valves of the same nominal diameter can be installed in parallel. The small hole on the valve body must not face upward, as water or debris entering the hole may affect valve operation.

FAQ

Can the Ratio Be Adjusted?

No. The pressure reduction ratio is determined by the internal valve core and cylinder liner dimensions. To change the ratio, the corresponding internal component configuration must be changed.

Is the Outlet Pressure Constant?

No. The outlet pressure changes proportionally with the inlet pressure according to the predetermined pressure reduction ratio.

How Is the Ratio Selected?

The ratio should be selected according to system requirements. For domestic water supply systems, the ratio is generally no more than 3:1; for fire protection systems, generally no more than 4:1; and for domestic hot water systems, generally no more than 2.5:1.

How Is the Valve Size Selected?

The nominal diameter should be selected based on pipeline size, flow rate, inlet pressure, outlet pressure requirements, and operating conditions. The available DN range should be confirmed according to the specific FUXEON® valve model.