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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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4.1 ★★★★★
Based on 1641 reviews
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Product Reviews
★★★★★ 4
Good, but not better than Pampers 360.
Size: Size 5, Unit Count: 100, Size: Size 5, Unit Count: 100
We use Pampers 360’s for our 18 month old, but we decided to try out Huggies 360’s to check if they were better
Huggies 360 differ from Pampers 360 in size. These Huggies are huge compared to Pampers, they fit true to size but are puffy and take up more space in the diaper bag and the diaper drawer.
My toddler prefers to run around wearing only a diaper. Huggies are less durable than Pampers, they will fray and pill more with the friction of surfaces.
They perform the same as the Pampers, we didn’t experience any leaks. They are also similar is softness to Pampers.
The elastic at the sides also seems tighter than Pampers.
The main reason we won’t be switching to Huggies 360 is that the absorbent panel in the front is wider and less flexible so more difficult to get into a comfortable position for my son’s anatomy.
They do function well as diapers, they just aren’t for us.
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Reviewed in the United States on June 2, 2025
★★★★★ 5
Que mi bebé se sienta comoda
Size: Size 6, Unit Count: 104
It is a good product. I recommend it; my daughter feels very comfortable.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
Good product overall
Size: 60 Count (Pack of 1)
Works really well, but only for a while. After about 3 or 4 weeks, it begins to stop working. Side effects-can leave you groggy if you don't get enough sleep. Helps you sleep better for a month or so. No odor. Good value for money, they don't cost a lot. Just melatonin and veggie caps. No other ingredients as far as I read
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Works well I will continue buying them
Size: 60 Count (Pack of 1)
This melatonin gives me a good nights sleep. I thought it was 3 mg but it is not, my mistake! I take two of these because 3 mg doesn't do it for me. I sleep like a baby when I take these and wake up feeling rested.
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Reviewed in the United States on April 4, 2026
★★★★★ 5
Incredibly Helpful for Sleep & Not Hard to Swallow w/Water or w/o
Size: 60 Count (Pack of 1)
I shouldn't be taking these due to certain medical conditions, but they taste like nothing, super effective - like I fall asleep within maybe 30-45 minutes - and I STAY asleep watch is a lot more than I can say for any other melatonin products that I've used. Again, I do have restrictions, so I only take them once in a while, but so does my roommate and he says the same. They're small enough to not be hard to swallow as well. I've recommended them to some of my friends and family and we're all in agreement. I mean, of course, consult your doctor first, but like, these have been one of the most helpful supplements for sleep which is super important to me
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Reviewed in the United States on December 20, 2025