Product Overview

The AQUA 80-451: Direct Acting Pressure Reducing Valve is a balanced, direct acting type pressure reducing valve. It is designed to reduce and maintain a lower and constant outlet (downstream) pressure, regardless of variations of inlet pressure and flow. Ideally suited to water distribution systems and domestic distribution systems, this valve protects installations from high inlet (upstream) pressure, offering a simple, reliable, and accurate solution for water management. It is a simple, reliable and accurate valve, compliant with EN 1567.

Key Benefits

• Constant Downstream Pressure: Effectively reduces and maintains a constant downstream pressure, irrespective of upstream pressure variations or flow rate changes.
• High Pressure Protection: Specifically designed to operate at high pressure, it can be used in continuous service with upstream pressures up to 25 bar, protecting installations from high inlet pressure.
• Pre-Adjustable System Pressure: Provided with an adjustment knob and a calibrated pressure indicator, allowing the system pressure to be pre-set to the required value even before installation.
• Low Pressure Loss: The internal hydraulic shape of the valve makes it possible to attain low pressure losses, even when a large number of draw-off outlets are open.
• Easy Maintenance: The cartridge, which includes the diaphragm, filter, seat, obturator, and compensating piston, is pre-assembled as a "self-contained unit" with the cover, and can easily be removed for inspection and maintenance purposes.
• Quality Materials & Compliance: Constructed from dezincification resistant alloy, stainless steel, and synthetic materials, ensuring durability. Complies with EN 1567 standards.

Applications

The AQUA 80-451 is suitable for a variety of water distribution and domestic systems where precise pressure reduction and regulation are required:

• Water distribution systems.
• Domestic distribution systems.
• Small housing developments.
• Protection against high inlet pressure in installations.

Features & Construction

• Balanced, direct acting type pressure reducing valve.
• Body and moving parts made from dezincification resistant alloy (EN 12165 & 12164).
• Cover made from PA 6 G 30.
• Stem: Stainless Steel.
• Seat: Synthetic material.
• Diaphragm and Gaskets: RBR.
• Strainer: Stainless Steel.
• Equipped with an adjustment knob and a calibrated pressure indicator with incremental movement for continuous adjustment.
• Compensated seats ensure the calibrated pressure value downstream remains constant regardless of changes to upstream pressure.

Technical Specifications

Specification	Value
Sizes	R 1/2" - 3/4" - 1" - 1 1/4" - 1 1/2" - 2"
Pressure Rating	PFA 25 bar max.
Downstream Adjustment Range	1 to 6 bar
Compliance	EN 1567
Medium	Water
Max. Working Temperature	40°C
Factory Setting	3 bar
Connections	BSP Male
Downstream Pressure Gauge	Optional
Flow Coefficient (Kv)	2.6 - 12.6 m³/h
Nominal Flow Rates (recommended avg. velocity 2 m/s)	1/2": 1.27 m³/h; 3/4": 2.27 m³/h; 1": 3.6 m³/h; 1 1/4": 5.8 m³/h; 1 1/2": 9.1 m³/h; 2": 14.0 m³/h

Dimensions (mm)

A (DN)	B	B2	C	D	E	Weight (kg)
1/2"	140	76	20.5	112	54	0.9
3/4"	160	90	20.5	112	54	1.1
1"	180	95	20.5	112	54	1.4
1 1/4"	200	110	40	178	73	2.6
1 1/2"	220	120	40	178	73	3.4
2"	250	130	40	178	73	4.3

Installation & Maintenance

• Installation: The pressure reducing valve AQUA 80-451 can be used in water distribution systems and on domestic distribution systems to protect installations from a high inlet (upstream) pressure. The system pressure can be pre-set to the required value even before the valve is installed using the adjustment knob and pressure indicator.
• Maintenance: The cartridge, which includes the diaphragm, filter, seat, obturator, and compensating piston, is a pre-assembled "self-contained unit" with the cover, and can easily be removed for inspection and maintenance purposes. The strainer screen, installed in the pilot supply line to protect the pilot system from foreign particles, must be cleaned periodically.