Overview

The Caleffi 533555 20mm 3/4" inline pressure reduction valve is made in Italy and Australia Watermark approved. The Caleffi 533555 pressure reduction valve features a pressure adjustment range of 100-600kPa with a factory setting at 500kPa. Caleffi is the one of only a rare few manufacturers in Australia offering a pressure reduction valve that can adjust to a pressure setting as low as 100kPa, which is required for specialized applications.

The pressure reduction valves are commonly installed in residential plumbing works such as after water meters or just before entering houses. The pressure reduction valves can ensure a stable water supply pressure supply, despite the fluctuations in the mains water supply pressure from the streets. 

The pressure reduction valves can serve as a more reliable and versatile alternative to more traditional pressure limiting valves, when used in hot water services such as electric, heat pump, gas storage and solar hot water heaters. The pressure reduction valve employs a membrane design inside with a stiff pre-loaded adjustable spring, opposed to a sliding piston mechanism found in a pressure limiting valve which often causes failures from clogging up. 

In real world installations, it is sometimes found that pressure limiting valves cannot limit pressures sufficiently in places where unusually high street mains pressures are present. This can cause troubles with ECV and PTR valves leaking on hot water services. The pressure reduction valves can be used in such situations and offer a far better pressure control from our infield experiences over the years in our own plumbing jobs in Brisbane. 

The pressure reduction valve comes with a BSP 6mm test plug inbuilt, where an optional pressure gauge can be inserted for pressure measurement at the outlet. The optional pressure gauge is shown in the photo gallery and can be bought for extra. It must be noted that the pressure gauge is only intended to be used as a measurement tool and must be removed after use, as it could rust inside out if left in a wet environment for prolonged periods of time. 

Technical Details

• Manufacturer: CALEFFI, Made in Italy
• Australia Watermark Approved
• Model: 533555
• Specifications:
• Flow Rate: 30L/min@100kPa; 130L/min@600kPa
• Maximum Working Temperature: 40°C
• Maximum Upstream (Inlet) Pressure: 1600kPa
• Downstream (Outlet) Setting Pressure Range: 100 kPa - 600 kPa 
• Factory Pressure Setting: 500kPa
• Optional pressure gauge can be inserted for downstream pressure measurement via the BSP 6mm test plug 
• Extractable and serviceable cartridge with stainless steel filter mesh
• Thread Size: 3/4" BSP (20mm) Female Thread (20FI x 20FI)
• Physical Thread Measurement: 26.441mm, refer to the BSP vs Physical Thread Measurement Table in the photo gallery
• Material: DR Brass Body
• Intended Use: Hot water heaters and street mains water inlet into residential dwellings. 
• SKU: 533555 and 533555-PRG

Package Contents

- Caleffi 533555 20mm 3/4" inline pressure reduction valve

- Package Weight 500g (620g with the optional gauge)