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Description
AVG PTR25-400-LF 25mm 400kPa Commercial PTR Pressure Temperature Relief ValveOverview Australian Valve Group (AVG) PTR25 400 LF 25mm (1") 400kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is Australian Watermark approved and intended for commercial hot water service applications, with a high kilowatt rating of 132kW. Pressure and temperature relief valves, known PTR valves are critical mechanical safety devices for all hot water services. The temperature sensing probe monitors the hot water service's
Overview
Australian Valve Group (AVG) PTR25-400-LF 25mm (1") 400kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is Australian Watermark approved and intended for commercial hot water service applications, with a high kilowatt rating of 132kW.
Pressure and temperature relief valves, known PTR valves are critical mechanical safety devices for all hot water services. The temperature sensing probe monitors the hot water service's temperatures. AVG PTR valve temperature probe is covered in a Teflon wrap to prevent any calcification build up overtime and to ensure long term accuracy. Inside the AVG PTR valve body, there is a piston mechanism that opens according to the pressure inside the water tank.
During the operation of the hot water services, the volume of the water will expand during heating cycles, as cold water heats up. This increased pressure can be dangerous if not regulated. The PTR valve regulates the pressure slowly dripping the water out of the tank in a controlled manner, usually via a discharge pipe into a drain or ground. Therefore, when the slow dripping is observed, it is just a perfectly normal PTR valve operation.
When there is a malfunction with the heating component or the thermostat in a hot water service, an uncontrolled heating can be extremely dangerous and explosions can occur catastrophically. PTR valve can detect this when the temperature and pressure exceed 99 deg or its preset pressure ratings. In this case, PTR valve will fully open and dump hundreds of liters of water to relieve the water heater tanks. The Kilowatt rating of the PTR valve refers to the rate that the PTR valve can dissipate this energy and this is regulated by Watermark and plumbing codes in Australia.
When a high kilowatt PTR valve rating is required in a commercial installation, a smaller sized 15mm or 20mm PTR valve must not be used as a cost cutting method for safety reasons.
Technical Details
- Brand: Australian Valve Group (AVG)
- Model: PTR25-400-LF
- Watermark License Number: 2639
- Expansion Rating: 132kW
- Pressure Rating: 400 kPa
- Temperature Rating: 99°C
- Thread Size: 1" BSP (25mm) Male MI thread and female FI thread
- Thread Size Physical Measurements: 33.249mm external male and internal female thread diameter (refer to the BSP sizing chart in the photo gallery)
- Insulation Jacket Included
- Material: DR Brass Body; Stainless Steel Pressure Spring; Copper/Stainless Steel Element; Silicon Seals.
- Intended Use: For commercial hot water service applications where high Kilowatt rating is required for the PTR valves.
- SKU: AVG-PTR25-400-LF
Package Contents
- AVG PTR25-400-LF PTR Valve 25mm (1") 400kPa
- Package Weight: 900g
Shipping Notes
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.8 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
Fast shipping!
Color: A-Silver, Style: Button
It is easy to use, heats quickly and prepares a coffee with a very good flavor and an excellent cream. The build quality feels solid and cleaning is easy. It has exceeded my expectations and I use it every day. I would recommend it to anyone who wants to enjoy quality espresso at home.
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Reviewed in the United States on June 8, 2026
★★★★★ 5
CASABREWS customer service is outstanding.
Color: A-Silver, Style: Button
I purchased the CASABREWS CM 5418 from Amazon a little over a year ago. For the price it is a very good, easy to use, compact, Expresso/Capaccino coffee maker. Although the unit worked to make satisfactory Expresso, the pressure gauge stopped working after a few months and the water extraction was not complete with each brew. Even though I was aware the unit was out-of-warranty, I decided to contact CASABREWS Customer Service Support via Email, to inquire about the issues and what possible remedies there might be. JoJo, from CASABREWS Service Team, replied quickly and although there were some “Flushing Procedures I could try”, JoJo immediately stated that a manager had authorized a replacement unit to be sent to me. Amazon delivered a new unit one day after our Email conversation was completed. I can only say that CASABREWS customer service is outstanding. Their “real” concerns about inconveniences I may have endured was refreshing. Kudo’s to CASABREW!
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Reviewed in the United States on March 30, 2026
★★★★★ 5
Rich Espresso, Great Value
Color: A-Brushed Silver
I’ve been using this espresso machine for a little while now and honestly I’m very happy with it. I wanted something simple, affordable, and easy to use without spending hundreds of dollars on a fancy coffee maker, and this one does exactly what I need.
The espresso comes out rich with a nice crema and the milk frothier works really well for lattes and cappuccinos. It heats up fast and doesn’t take much effort in the morning, which I love.
One of my favorite things is how easy it is to clean and maintain. The removable water tank helps a lot and overall it doesn’t feel like a machine that requires constant work.
For the price, the quality is surprisingly good. It looks nice on the counter, feels sturdy, and makes coffee that tastes much better than I expected
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Reviewed in the United States on May 3, 2026
★★★★★ 5
Very good
Color: A-Brushed Silver
Here its my review for this espresso machine. The stainless steel design looks modern and premium, and it fits perfectly in small spaces without taking up too much room.
The espresso comes out with a rich flavor, and the milk frother works great for making lattes and cappuccinos at home. I also like the pressure gauge because it helps monitor the extraction process.
Perfect option if you want café-style drinks without spending a fortune on a large machine.
Easy to use, easy to clean, and looks beautiful on the counter.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Great product, excellent value for money!
Color: A-Brushed Silver, Color: A-Brushed Silver
I'm very satisfied with this purchase. It consistently brews rich and aromatic coffee, and the stainless steel body looks stylish and modern on my kitchen countertop. This coffee maker is easy to operate, heats up quickly, and is easy to clean. It feels sturdy and durable, with excellent workmanship. For someone who drinks coffee every day, it's definitely a worthwhile investment. Excellent quality and great value for money!
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Reviewed in the United States on June 6, 2026