AVG PTR20-850-LF 20mm 850kPa PTR / TPR Pressure Temperature Relief Valve
SKU: 14006518228

AVG PTR20-850-LF 20mm 850kPa PTR / TPR Pressure Temperature Relief Valve

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Description

AVG PTR20-850-LF 20mm 850kPa PTR / TPR Pressure Temperature Relief ValveOverview Australian Valve Group (AVG) PTR20 850 LF 20mm (3 4") 850kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is cross compatible with other popular makes such as Reliance HT55 PTR valve with same fitments and functions. During the hot water services' heating cycles, the volume of water will expand as the temperature increases. This volume expansion creates excessive pressure inside the water cylinder and must be regulated.

Overview

Australian Valve Group (AVG) PTR20-850-LF 20mm (3/4") 850kPa PTR Pressure and Temperature Relief Valve (also known as TPR valve) is cross compatible with other popular makes such as Reliance HT55 PTR valve with same fitments and functions.

During the hot water services' heating cycles, the volume of water will expand as the temperature increases. This volume expansion creates excessive pressure inside the water cylinder and must be regulated. The AVG PTR valve is designed to regulate and relieve the pressure in hot water services by dripping in a controlled manner. 2-5L a day of dripping is normal, depending on the hot water usage and the amount of heating going into the water.

The AVG PTR valve is also a mechanical protection device for the hot water services. In rare occasions of faulty thermostat or heating element, the hot water service can overheat and build dangerously high pressures. When the AVG PTR valve senses this abnormally high temperature and pressure, it will dump large amounts of water in hundreds of liters for an emergency pressure relief.

A functioning PTR valve is a requirement by law in Australia for safety and the AVG PTR  valve is approved under the Watermark standard. The AVG PTR valve comes with an insulation jacket and allows for a professional look and minimal heat loss.

A PTR valve usually has a life span about 5 years and needs replacing if you notice excessive water leakage in a stream instead of a controlled dripping. The AVG PTR valve is cross compatible with many other brands such as Reliance, Tomson, Nefa and Reflex.

The AVG PTR valve fits perfectly with mainstream heat pump, solar, electric and gas storage water heater brands such as Rheem, Vulcan, Rinnal, Dux, Aquamax, Thermann, Apricus and Solahart. 

The 3/4" (20mm) size is mostly commonly used in commercial applications where the larger expansion ratings are required and specified by the local plumbing rules.

For residential hot water services, the 3/4" 20mm thread size will work also. However, a 1/2" (15mm) PTR valve with a reducer fitting is usually used instead for residential applications to save the costs. 

Technical Details

  • Brand: Australian Valve Group (AVG)
  • Model: PTR20-850-LF
  • Watermark License Number: 2639
  • Expansion Rating: 46 kW 
  • Pressure Rating: 850 kPa
  • Temperature Rating: 99°C
  • Thread Size: 3/4" BSP (20mm) Male MI thread and female FI thread
  • Thread Size Physical Measurements: 26.441mm external male and internal female thread diameter (refer to the BSP sizing chart in the photo gallery)
  • Insulation Jacket Included 
  • Material: DR Brass
  • Intended Use: Electric tanks, solar tanks, gas storage tanks and heat pumps
  • SKU: AVG-PTR20-850-LF

Package Contents

  • AVG PTR20-850-LF 20mm (3/4") 850kPa PTR Valve with insulation jacket
  • Package Weight: 500g

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 14006518228

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Adil J Hamad
Waukegan, US
★★★★★ 2
Potential Buyers Be Fore-warned
Some how, my 1st review with photos & details of why I WAS rating 3 stars did not get posted. Cannot include those images that showed the condition that I found this product after I opened the shipping material. I found the exterior of the container covered with the cream & more cream was oozed out all around the bottom edge of the lid. I had to take a paper towel & wipe the excess cream product from the exterior of the container, in order to open the jar. When I did, there was more cream smeared all over the foil that was supposed to be sealed, & the grab tab to remove the foil was crimpled up off the rim of the jar with more cream oozed out all over the jar threads (for turning the lid to close the jar shut). I don't know when all of that happened to this item, & I wondered about the integrity & safety of the cream product having received it opened & appearing to have been very much compromised. The only reason that I took the time required to clean this product off was that at least it looked, felt, & smelled like the cream product that I have used before.
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Reviewed in the United States on August 21, 2025
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Melissa Adams
Chelsea, US
★★★★★ 5
amazing quality for the price
Color: Glitter-9oz-60
These 9 oz gold plastic cups were the perfect finishing touch for our elegant shower theme. The hard plastic feels sturdy and high-quality and definitely not the flimsy disposable kind you might expect at this price point. The gold glitter finish added just the right amount of sparkle and sophistication to our décor.
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Reviewed in the United States on January 22, 2026
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Yenn
Grantham, US
★★★★★ 5
Cute and elevated
Color: 10-Gold-100
These are really cute and really elevate our client experience at a minimal investment. We offer a complimentary glass of champagne to our clients and we use these as an addition to serve juice, soda or water. They are durable and pretty think, much better than using a thinner red solo cup and the gold addition the cups really makes them look expensive.
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Reviewed in the United States on May 6, 2026
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Kim CALDWELL
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★★★★★ 5
Great cups for any occassion!
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These cups worked great for the rehearsal brunch and we were able to use the rest at one of the beverage stations at the reception. They were very good quality and the silver ring around the top added extra sparkle. Highly recommend!
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Reviewed in the United States on April 27, 2026
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George Anthony
Alexandria, US
★★★★★ 5
Great Quality and Elegant Look!
Color: 9-Silver-100
I ordered these 9 oz silver-trimmed plastic cups for a dinner gathering , and they turned out perfect. The silver rim gives them an upscale, classy look great for parties or more formal events like weddings. They’re sturdy and don’t feel flimsy at all, even when filled with ice and drinks. Guests complimented them several times, thinking they were real glass! Cleanup was easy since they’re disposable, but honestly, they’re durable enough to rinse and reuse if you want. Highly recommend for anyone looking to elevate their party setup without spending a lot.
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