Will this pressure valve reset after water line thaws

The preset pressure relief valve will still be set at 75 PSI as long as the valve is not broken because it was frozen. If a valve is allowed to freeze then the warranty is void. To answer your question thawing out a water line will not change the valve preset pressure.

In my house main, I have installed pressure relief valves but they all leak at a drop/second Would the leak stopped over time as it stabilizes?

If the pressure on the house main is close to 75psi then it will continue to drip, or if the pipes were not flushed out before the valve was installed then a small piece of something like sand could be wedged under the seal of the valve. So, no for sure answer if it will quit. Unless the water pressure in the pipe is around 75 psi.

How do you adjust the pressure? There was no documentation.

This valve can not be adjusted. We can not assume the liability if adjusted incorrectly or set at to high a pressure.

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PRVNL75

Product ID: 229523294

Details

Brand
Merrill
Exterior Finish
Brass
Inlet Connection Size
0.75 inches
Inlet Connection Type
National Pipe
Item dimensions L x W x H
2.47 x 1.45 x
Material
Brass

♻️Lead-Free Brass with Stainless Steel Springs

⚖️75 PSI Max Pressure Rating

🛠️3/4" NPT Threaded Connection

P890

Duties & taxes included

In stock

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Description

🚀 Elevate Your Plumbing Game with Precision Pressure Control!

EFFORTLESS INSTALLATION - Standard 3/4" male NPT x 1/2" female FPT threaded connections make setup quick and hassle-free—perfect for busy professionals.
CERTIFIED SAFETY COMPLIANCE - IAMPO and RoHS certified, ensuring industry-leading standards and peace of mind for your professional projects.
PRECISION PRESSURE PROTECTION - Engineered to safeguard your cold water systems from dangerous overpressure with a reliable 75 PSI relief threshold.
DURABLE LEAD FREE CONSTRUCTION - Crafted from premium lead-free brass paired with corrosion-resistant stainless steel springs for longevity and eco-conscious performance.
OPTIMIZED FOR COLD WATER SYSTEMS - Specifically designed for cold water applications, ensuring optimal performance without compromise—know your valve, avoid costly mistakes.

The Merrill MFG PRVNL75 is a high-quality, lead-free brass pressure relief valve rated for 75 PSI with 3/4" NPT threaded connections. Certified by IAMPO and RoHS, it offers reliable protection for cold water systems with durable stainless steel springs, ensuring safety and compliance for professional-grade plumbing installations.

Specifications

ASIN	B08D3YMKWB
Best Sellers Rank	#30,004 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #16 in Relief Valves
Brand	Merrill
Brand Name	Merrill
Connector Type	Threaded
Customer Reviews	4.5 out of 5 stars 383 Reviews
Exterior Finish	Brass
Inlet Connection Size	0.75 inches
Inlet Connection Type	National Pipe Tapered
Item Dimensions	2.47 x 1.45 x 1.05 inches
Item dimensions L x W x H	2.47 x 1.45 x 1.05 inches
Manufacturer	Merrill Manufacturing Company
Manufacturer Part Number	PRVNL75
Material	Brass
Material Type	Brass
Maximum Operating Pressure	75 psi
Model Number	PRVNL75
Number of Items	1
Number of Pieces	1
Number of Ports	2
Outlet Connection Size	0.75 inches
Outlet Connection Type	MNPT
Size	3/4 inch
Specification Met	IAMPO, RoHS
Thread Size	3/4 inches
Thread Type	NPT
UPC	642367450236
Unit Count	1 Count
Valve Type	Pressure Relief Valve

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