How do you use a water hammer arrestor?

When a valve closes fast and stops the flow, momentum shakes and pounds the pipes. A water hammer arrestor works by cushioning the impact with air so that the momentum is absorbed.

Can install a water hammer arrestor horizontally?

Water hammer arrestors can be installed vertically, horizontally, or at any angle in between. When installing an arrestor, it is important to place it as close as possible to the valve.

Are water hammer arrestors required with PEX?

Water hammer arrestors are required on any valves where a plastic pipe is used for water distribution, which indicates that they are not required for PVC and PEX.

Will water hammer arrestors eliminate piping vibration?

Vibrations caused by shocks in the piping system may be avoided by installing a water hammer arrestor near the quick closing valve.

Will a water hammer arrestor prevent check valve slam?

Watts water hammer arrestors will absorb shock and minimise the slamming noise, while a soft seat in the check valve will ensure quiet closure.

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WATTS Water Hammer Arrestors

Watts water hammer arrestors absorb shock when water flowing in a piping system suddenly stops due to fast closing shutoff valves, dishwashers and cloth washers. These water hammer arrestors protect against the potentially damaging effects of water hammers.

Filter

Style	Model	Body Material	Connection Type	Diameter	Factory Set Pressure	Max. Working Pressure	Mfr. Series	Overall Height	Overall Width	Price (ex. VAT)
A	LF05-S 3/4	Copper	Socket	-	60 psi	10 Bar	LF05	4.88"	1"	€107.39
B	LF05A-CH 3/4	Copper	Female Threaded	-	60 psi	10 Bar	LF05	5.625"	1.25"	€112.52
C	1 LF15M2-D	Copper with Low-Lead Brass Adapter	MNPT	2.125"	60 psi	-	-	9 15/16"	-	€206.14
D	1 LF15M2-E	Copper with Low-Lead Brass Adapter	MNPT	2.125"	60 psi	-	-	12 11/16"	-	€285.87
E	LF15M2-A	Copper with Low-Lead Brass Adapter	MNPT	1.125"	60 psi	-	-	5 15/16"	-	€42.08
F	LF15M2-F	Copper with Low-Lead Brass Adapter	MNPT	2.625"	60 psi	-	-	11.156"	-	€366.63
G	LF150A-HA 3/4	Stainless Steel	Male Hose Threaded	-	30 psi	10.3 Bar	LF150A	4.3125"	3.4062"	€184.65
H	LF150A	Stainless Steel with Brass Adapter	MNPT	4 13/32"	25 to 35 psi	-	-	4-5/16"	-	€111.35

Water Hammer Arrestors

When a shutoff valve, dishwasher, faucet or washer closes quickly and stops the flow, the momentum it creates shakes and pounds pipes. Watts water hammer arrestors are designed to prevent this condition by employing a cushion of air that can effectively absorb the momentum. These water hammer arrestors prevent noise and damaging effects of water hammers to the pipes, making them ideal for commercial and industrial applications. Watts water hammer arrestors feature a copper body and come with a lead free, brass built threaded adapter for easy installation in a new or existing piping system, at any desired angle.

Uses

Watts water hammer arrestors are used with dishwashers, cloth washers and faucet water systems.

Working Mechanism

Water develops momentum as it flows quickly through pipes. When a valve closes quickly and stops the flow, that momentum shakes and pounds pipes. Watts water hammer arrestors cure this condition with a cushion of air that absorbs the momentum. Before you install a Watts water hammer arrestor, determine which faucet or valve is causing the noise.

Features

Watts water hammer arrestors prevent banging noise and damage to pipes and appliances caused by water pressure shock.
These water hammer arrestors are maintenance free, owing to the piston being the only moving part.
Watts water hammer arrestors have a pre-charged, permanently sealed air chamber that absorbs the shock, prevents loss of air to the water and ensures trouble free performance.
They come with an NPT solid hex brass adapter or solder end connection to ensure easy installation.
These water hammer arrestors are sealed with EPDM for efficient working within the temperature range of 33 to 180 degrees Fahrenheit and under working pressure of 200 psi.
Selected Watts water hammer arrestors have rugged, sealed-in diaphragm flexes to absorb shock.

Compatible Accessories

Watts check & foot valves: Use water hammer arrestors with Watts check and foot valves to stop repeated water hammers that can cause significant damage, leading to the catastrophic failure of gasketed joints & expansion joints, and affecting the integrity of pipe walls and welded joints.
Watts pressure regulators: Install Watts pressure regulators in the supply line with Watts water hammer arrestors for effective prevention of water hammers.

Standards and Approvals

Watts water hammer arrestors comply with ASSE, CSA, FM, NSF, UL, ULC, USC and WQA standards.

Installation

Depending on the piping arrangement, Watts water hammer arrestors can be positioned in various locations. Ideally, the hammer might either originate from the pump / check valve / isolation, or it might originate from the point where the pipe turns, such as at the top of a pump riser. When the branch line exceeds a length of 20 ft, additional Watts water hammer arrestors must be installed.