L-Pattern Anti Water Hammer Surge Arrestor – Z-Tide Industrial ALF-C Series
The Z-Tide Industrial ALF-C Series is a premium L-pattern anti water hammer surge arrestor designed to protect water systems against hydraulic shock while providing a compact solution for pipework installed around 90° bends. Combining a pre-charged diaphragm air chamber with a patented flow-directing impeller, the ALF-C Series rapidly absorbs pressure surges while stabilising flow through the pipeline. The compact angle design allows direct installation at pipe corners, reducing installation space and eliminating additional elbows or complex pipework. Available in cast iron with JIS10K flanges from DN50 to DN200, the ALF-C Series provides reliable long-term protection for industrial, municipal and commercial water systems.
Valve function & operation
Function: L-pattern anti water hammer surge arrestor
Hydraulic shock absorber
Operating principle: Pre-charged diaphragm air cushion with flow-directing impeller
Absorbs hydraulic shock and stabilises flow
Suitable for horizontal or vertical installation
Flange sizes: DN50, DN65, DN80, DN100, DN150 and DN200
Standard flange: JIS10K
Optional flange standards:
PN10
PN16
JIS20K
ANSI 150 lb
Pressure & performance
Working pressure: 0 to 12 Bar
Pressure tested: 21 Bar
Pre-charge pressure: 2.5 Bar
Adjustable via Schrader valve
Air chamber volume: 1,490 cc to 27,230 cc
(According to valve size)
Pressure gauge: Included
Maximum media temperature: +80°C
Minimum media temperature: -15°C
Maximum media viscosity: 50 cSt
Mounting position: Any position
Construction & materials
Body: Cast iron
Air chamber: Pre-charged diaphragm type
Diaphragm: NBR
Standard seals: NBR
Optional diaphragm:
FKM (Viton)
Schrader charging valve included
Media compatibility
✓ Water
✓ Process water
✓ Cooling water
✓ Irrigation systems
✓ Water-based fluids compatible with the valve materials
Performance & design
✓ Patented L-pattern surge arrestor design
✓ Patented flow-directing impeller stabilises flow while reducing hydraulic shock
✓ Pre-charged diaphragm air cushion rapidly absorbs pressure surges
✓ Compact 90° configuration eliminates additional elbows and reduces installation space
✓ Pressure gauge allows quick monitoring of air chamber pressure
✓ No sliding mechanical components for reliable, low-maintenance operation
✓ Suitable for horizontal or vertical installation
✓ Protected by Patent No. 140580
Installation recommendations
For optimum protection, install the ALF-C at the first pipe bend immediately downstream of fast-closing valves or pumps.
For pipe runs exceeding 50 metres or systems operating above 5 Bar, a second surge arrestor is recommended at the first bend following the longest straight pipe section.
Maintain a minimum clearance of 100 mm from adjacent walls to allow future servicing and pressure adjustment. Air chamber pressure should normally be maintained between 60% and 90% of the operating pipeline pressure. Where the outlet discharges to atmosphere, such as into a storage tank, a pre-charge pressure of approximately 1.0 to 1.3 Bar is recommended.
Where water hammer occurs
Water hammer commonly develops:
✓ Downstream of check (non-return) valves
✓ At pipeline direction changes
✓ Long horizontal pipe runs exceeding 50 metres
✓ Pump start-up and emergency shutdown
✓ Fast-closing valves and automated control systems
Applications
Pump discharge pipework
Municipal water systems
Industrial process water
Cooling water systems
Irrigation systems
Booster pump stations
Compact plant rooms
Water treatment plants
General industrial water distribution
Manufacturing quality
Manufactured using a heavy-duty cast iron body with a pre-charged diaphragm air chamber and patented flow-directing impeller, the Z-Tide Industrial ALF-C Series has been engineered to provide reliable long-term protection against water hammer and hydraulic shock. Unlike conventional inline surge arrestors, the L-pattern configuration combines pressure absorption with controlled flow redirection, allowing the arrestor to be installed directly at pipeline corners where hydraulic shock is often most severe. The pre-charged diaphragm separates the air cushion from the water supply to maintain consistent long-term performance, while the integrated pressure gauge and Schrader valve allow quick inspection and adjustment of the air chamber. Protected by Patent No. 140580.
Ordering information
Simply select the required flange size and flange standard before adding the surge arrestor to your basket. Optional flange standards, FKM diaphragms and stainless steel versions with working pressures up to 20 Bar are available on request.
Pressure:
3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar, 7.5 Bar, 8 Bar, 8.5 Bar, 9 Bar, 10 Bar, 12 Bar
Seals:
NBR
Media:
Water
Options required:
Anti Water Hammer
Orifice:
125mm, 150mm, 200mm, 50mm, 65mm, 80mm
Body Material:
Cast Iron
Port Size:
2 inch Flange DN50, 21/2 inch Flange DN65 , 3 inch Flange DN80 , 4 inch Flange DN100 , 5 inch Flange DN125 , 6 inch Flange DN150 , 8 inch Flange DN200
