Hi will this work on low pressure gravity flow?

According to the listing, water pressure at the valve should be 5-PSI or more (some say 8-PSI.) Pressure created by a gravity system will depend on the configuration of the system. If the water tank is elevated, pressure at ground level will be higher than if the tank is at ground level. The higher the tank, the higher the water pressure at the valve (ground level.) Using a value of 0.433 PSI per foot, it would require the storage tank to be almost 12-feet above the float valve if you need 5-PSI at the valve. If you need 8-PSI at the valve, the tank would need to be closer to 20 feet high. (To supply reasonable pressure for general household use, the water tank would probably need to raised to about 100 feet.)

How do you mount this

It must be mounted in the vertical position. I have 2 of these used on 2 different bulk water tanks. Screw it onto a a threaded pipe and position it at the desired water level. The valve must be solidly secure to work properly (I used a bulk head fitting attached to the accessed lid with a cam lock quick connector) One of the valves has been in use for around 4 years the other 2 years. Hope this helps. Let me know if you have other questions.

I want a 1" Hudson Valve, but in the description it doesn't say this is 1". Can you confirm please

The threads are 1” for sure. I just installed one last week in the trough in my arena. I must say that the newer ones are improved over my older ones. The valve diaphragm will need cleaning periodically because algae and scale will gather inside the valve. The Nelson valve is our best unit compared to others we have used. Very reliable.

It doesn't explain how the unit mounts to the tank?

It doesn't mount to the tank, it threads onto a 3/4" or 1" male fitting. In my case, 1" pipe ran into a fish pond and this valve threaded right on.

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Hudson Valve V Hudson Tank Valve for Livestock - 718H, nylon resin, Black

Hudson Valve V Hudson Tank Valve for Livestock - 718H, nylon resin, Black

Product ID: 15465820

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Details

Material
nylon resin
Brand
Hudson Valve
Item dimensions L x W x H
5 x 3.75 x 5
Exterior Finish
ABS Plastic
Inlet Connection Size
1 Inches
Maximum Operating Pressure
689476 Pascal

💧Flow rate 5-40 GPM for versatile water control

⚙️1" FNPT connection for seamless plumbing integration

🛡️Freeze-resistant, rustproof, and durable nylon resin build

Description

💧 Hudson ValveV: The silent powerhouse your water system deserves.

BUILT TO LAST - Indestructible ABS plastic resists rust, freezing, and wear for years of reliable use.
COMPACT DISCREET - Fits tight spaces and tucks away neatly, keeping your setup clean and professional.
SLEEK NO LEVER DESIGN - Pressure-activated valve closes smoothly without bulky external parts.
VERSATILE APPLICATIONS - Perfect for livestock tanks, irrigation, pools, fountains, and more—one valve, endless uses.
EFFORTLESS INSTALLATION - Snap it on your existing setup or use a mounting bracket—no plumber needed.

The Hudson ValveV 718H is a 1-inch nylon resin float valve engineered for durability and ease. Featuring a no-lever, pressure-activated design, it delivers a flow rate of 5 to 40 GPM and withstands pressures up to 100 psi. Freeze-resistant and rustproof, it installs quickly on existing plumbing or with a mounting bracket, making it ideal for livestock tanks, irrigation, pools, and more.

Specifications

Material	nylon resin
Brand	Hudson Valve
Item dimensions L x W x H	5 x 3.75 x 5 inches
Exterior Finish	ABS Plastic
Inlet Connection Size	1 Inches
Maximum Operating Pressure	689476 Pascal
Number of Ports	1
Outlet Connection Size	1 Inches
Valve Type	Hudson Float Valve
Global Trade Identification Number	00766069610009
Manufacturer	HORIZON DISTRIBUTION
UPC	766069610009 094706473886 066069610000
Part Number	718H
Item Weight	12 ounces
Product Dimensions	5 x 3.75 x 5 inches
Item model number	718H
Is Discontinued By Manufacturer	No
Size	1 Inch
Color	Black
Style	Tank Valve
Item Package Quantity	1
Included Components	Float Valve
Batteries Included?	No
Batteries Required?	No

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