SKU: 93399475474

CALEFFI 533555 Inline 20mm Pressure Reduction Valve, 100-600kPa Adjustable

Sale price$74.70 Regular price$83.00
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Description

CALEFFI 533555 Inline 20mm Pressure Reduction Valve, 100-600kPa AdjustableOverview 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.

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)

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 93399475474

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Birmingham, US
★★★★★ 5
Pretty good, especially for this price point.
Color: Beige, Size: 21.5"- 1 Panel
This is merely a piece of cloth stretched between the frame borders, but it works perfectly. It arrived quickly, all parts present and in good condition. I didn't put the castors on, as it will be more or less always in one position. I simply attached some felt sliders on the bottom to prevent scratching the floor and to allow clearance for the center screw (which is not flush fit). Overall, a reasonable deal for the price point.
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Lowell, US
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Easy to manage
Color: Black, Size: 88"- 4 Panel
Sturdy, easy to manage and roll around. The material for the walls is of a decent ply as well
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Samson Yu
Grantham, US
★★★★★ 4
Great product!
Color: Beige, Size: 88"- 4 Panel
Worked well and it was easy to roll around and fold. The size is great and has a good weight to it. Very sturdy, I plan to buy more
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Phoenix, US
★★★★★ 5
Wonderful Room Partition !
Color: Black, Size: 88"- 4 Panel
This product is made very well, packaged, and assembled with no problems. All parts and tools are included (except a Phillips screwdriver.) I put this item all together by myself on a bed to make it easy and simple. I made sure that every screw head was attached where the recessed dimples are located on the vertical poles, just don't overtighten anything. Everything fits like a charm, good quality, looks great, perfect height, rolls with ease, proper privacy, really impressive ! I got the 4-panel in black color. I would certainly buy this item again ! Thank you !
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Very flimsy but does the job intended
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Reviewed in the United States on May 27, 2026

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