If you're in the market for a double check valve assembly, buy Apollo Valves, and buy them from ValveMan.com.  We've been in the industrial valve business for over 50 years and we carry the Apollo Valves brand, including a full line of double check valve assemblies and backflow preventers.  We know all about valves because valves are all we sell.  It's simply what we do, and we do it better than anyone else.  If you would like to know more about why you should choose Apollo Valves, or you would just like further reading, you may enjoy Why Choose Apollo Ball Valves.

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● 22mm Straight Automatic Bypass Valve ● Reduces system noise ● Maintains an even system pressure ● Constant flow through the boiler Product Code: ABBV1ST

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Water hammer can cause extensive damage to your plumbing system, not to mention the costly repairs and replacements that follow. Fortunately, the Tower Shock Arrestor is here to help prevent water hammer and provide you with peace of mind.

Water hammerArrestor

Introducing the Tower Shock Arrestor – the perfect solution to protect your plumbing system and appliances from the damaging effects of water hammer!

Hammerarrestorvalve open or closed

Apollo 4ALF-207-A2F - 1-1/2", Bronze, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly w/ Ball Valves, Lead Free

Industrial water hammerArrestor

Our shock arrestor is designed to absorb the pressure wave that occurs when water flow is suddenly stopped, preventing it from travelling through your pipes and causing damage. With a capacity of 0.16 litres and a maximum operating pressure of 10 bar, the Tower Shock Arrestor is perfect for use in residential and commercial plumbing systems.

Double check valves are the workhorse among check valve assemblies.  As they are designed to be more reliable, and handle greater flow capacities--many Apollo double check valves are marketed as backflow preventers--then single check valve systems, double check valves are indispensable when it comes to preventing undesirable backflow and back syphonage.  As a direct cross-connection piece, a double check valve is subjected to both intermittent and constant pressure conditions.  Using a double check valve assembly is smart.  Using double check valves that employ ball valves is even smarter, as these ball valve balls are free-floating, meaning they seat and un-seat in direct response to current and pressure.  There is only one through hole, and the ball is slightly larger than the through hole, providing a tight, reliable seal that prevents water from traveling in the opposite direction.

In addition to preventing water hammer, the Tower Shock Arrestor can also improve the efficiency of your plumbing system, reduce noise, and create a more comfortable environment. Plus, with little maintenance required, you can enjoy peace of mind knowing that your plumbing system is protected with minimal effort.

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This product is WRAS approved. WRAS approval demonstrates it is of a suitable quality and standard against the Water Supply (Water Fittings) Regulations and Water Supply (Water Fittings) (Scotland) Byelaws, provided it is installed and used in accordance with the installation and requirement notes and any other restrictions within the approval. Any water fitting, which when installed, will carry or receive water from the public mains water supply in the UK, must comply with these regulations. They require that a water fitting should not cause waste, misuse, undue consumption or contamination of the water supply and must be ‘of an appropriate quality and standard’. To learn more about compliance, visit: www.wrasapprovals.co.uk

Approved by WRAS, our shock arrestor is made with high-quality materials and is designed to last. The Mini Expansion Vessel type device is potable, making it safe for use with drinking water.

Traditionally, double check valves have always been spring loaded, but variation on this theme began incorporating the use of ball valves, which many would attest as providing a superior seal and action.  Regardless, using ball valves on a double check valve assembly--if nothing else--permits the control of greater pressures and flow capacities, making them desirable on larger systems.

2" water hammerarrestor

Shock arrestorinstallation

Installation is a breeze, and our shock arrestor can be installed in a vertical or horizontal position. Simply connect it to your plumbing system using the 1/2″ BSP TM connection, and you’re good to go!

Apollo 4ALF-10G-03 - 10", FDA Epoxy Coated Ductile Iron, Backflow Preventer, Double Check Valve Assembly w/ OSY Gates, Lead Free

Large Water HammerArrestor

Apollo 4ALF-10E-03 - 8", FDA Epoxy Coated Ductile Iron, Backflow Preventer, Double Check Valve Assembly w/ OSY Gates, Lead Free

Apollo Valves predominantly uses ball valves for their line of double check valves.  The following example of their double check valve assembly should give you some idea as to why:

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Also called a DCA (double check valve assembly), a double check valve is nothing less than a backflow preventer.  Its typical purpose is the prevention of contamination from the phenomena of backflow and backsiphonage polluting potable water supplies.  While this device may appear to be nothing more than a glorified check valve, and is not necessarily suitable for high hazard applications, it is nonetheless perfect for sprinkler and irrigation systems and space-saving combi-boilers.

Apollo 4ALF-206-A2F - 1-1/4", Bronze, Backflow Preventer, Reduced Pressure Zone (RPZ) Assembly w/ Ball Valves, Lead Free

Don’t let water hammer damage your plumbing system and appliances – choose the Tower Shock Arrestor today and enjoy a more efficient and comfortable plumbing system.

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Much like the air brake system valves in tractor trailers, a double check valve employs two separate check valves assembled in a linear series.  The thinking behind this configuration is simple: if one valve fails, the other will continue to operate.  Likewise, an extra valve gives the idea of a fool-proof seal credence, as it reduces the pressure on the first valve, helping to eliminate leakage.