Valves
swtwater.com Aquamatic K52 Series
Composite Diaphragm Valves
 
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AquaMatic K52 Series Composite Diaphragm Valve
AquaMatic K52 Series Composite Diaphragm Valves with glass-filled thermoplastic body and cap are designed for water treatment applications including those requiring acids, and harsh caustic chemicals that would rapidly corrode metal valves. Their unique Y-pattern design with a large seat opening and high lift disc permits higher flow rates at lower pressure loss than competitive valves. This product is manufactured in the United States of foreign and domestic parts.
 
 
Typical Applications
• Chemical Injection
• Deionizers
• Desalinization
• Detergent and Bleach Handling
• Electronic Industry
• Evaporation
• Fertilizer Spray Equipment
• Level Control Systems
• Metal Recovery Systems
• Mining Wastes
• Process Water Systems
• Water Treatment Systems
Features and Benefits
• All components can be serviced while the valve is inline
• Separate flow and control chambers permit positive closing without springs
• Reinforced diaphragms are pre-formed and stress relieved to maximize responsiveness and product life
• Diaphragm acts as an actuator, eliminating the need for electric or pneumatic actuators
• All internal parts in contact with media are made of composite materials *
• Seals are ethylene propylene for better chemical resistance **
• Available in sizes from 1/2 to 2-1/2 inch
• A variety of end connectors are available to make the valve compatible in pipe sizes from 3/8 to 3 inch
• Adaptable to a wide variety of control devices
* Normally closed valve configurations are NOT recommended when used with corrosive fluids.
** Valves are NOT recommended for use with any aromatic, hydrocarbon-based media.
 
 
Certified by IAPMO R&T to NSF/ANSI 61 and NSF/ANSI 372 for lead free compliance.
Operating Specifications
Max Pressure: 125 psi (8.6 bar)
Max Temperature: 140°F (60°C)
NOTE: IAPMO R&T NSF/ANSI 61 and NSF/ANSI 372 certifications are limited to restrictions below. Other options were not tested for certification.
Cold water applications below 73°F (23°C).
Normally Open valves.
EPDM seal material (seal option #1).
Options
• Normally open (standard)
• Normally closed
• Spring-assist closed
• Spring-assist open
• Limit stop for flow control
• Position indicator
• Seal and diaphragm materials for special applications
 
 
 
Principles of Operation
Open K52 Diaphragm Valve Drawing
 
Closed K52 Diaphragm Valve Drawing
 
 
Dimensions and Weights
K52 Union End Connectors Dimensions Drawing K52 Female Socket Weld End Connectors Dimensions Drawing K52 Male Socket Weld End Connectors Dimensions Drawing
Union
End Connectors		 Female Socket Weld
End Connectors		 Male Socket Weld
End Connectors
 
K52 Grooved Adapter End Connectors Dimensions Drawing K52 Flanged End Connectors Dimensions Drawing
Grooved Adapter
End Connectors		 Flanged
End Connectors
 
Model
Number		 Pipe
Size
Inch
(mm)		 Cv
(Kv)		 End
Connector
Style		 Approximate Dimensions
Inch (mm)		 Approx
Weight
A B C D E F
K520 1/2
(15)		 4.0
(3.5)		 Union 7.00
(178)		 2.62
(66.5)		 4.87
(124)		 — — — 1 lb
(0.5 kg)
K521 1
(25)		 15.0
(13.0)		 Union 9.00
(229)		 4.06
(103)		 6.31
(160)		 — — — 1 lb
(0.5 kg)
K524 1-1/2
(40)		 38.0
(32.8)		 Union 12.50
(318)		 5.06
(129)		 9.31
(236)		 — — — 2 lb
(0.9 kg)
K524 2
(50)		 41.0
(35.5)		 Socket
Weld		 10.50
(267)		 5.06
(129)		 — — — — 2 lb
(0.9 kg)
K526 2-1/2
(65)		 100.0
(86.5)		 Socket
Weld		 15.00
(381)		 7.31
(186)		 — — — — 6 lb
(2.7 kg)
K520 1/2
(15)		 4.0
(3.5)		 Grooved
Adapter		 7.00
(178)		 2.62
(66.5)		 3.93
(100)		 — — — 1 lb
(0.5 kg)
K521 1
(25)		 15.0
(13.0)		 Grooved
Adapter		 9.00
(229)		 4.06
(103)		 4.50
(114)		 — — — 1 lb
(0.5 kg)
K524 1-1/2
(40)		 38.0
(32.8)		 Grooved
Adapter		 13.25
(337)		 5.06
(129)		 7.75
(197)		 — — — 2 lb
(0.9 kg)
K524 2
(50)		 41.0
(35.5)		 Flanged 9.00
(229)		 5.06
(129)		 6.00
(152)		 0.75
(19.1)		 4.75
(121)		 0.69
(17.5)		 2 lb
(0.9 kg)
K526 2-1/2
(65)		 100.0
(86.5)		 Flanged 11.37
(289)		 7.31
(186)		 6.94
(176)		 0.94
(23.9)		 5.50
(140)		 0.69
(17.5)		 6 lb
(2.7 kg)
K526 3
(80)		 100.0
(86.5)		 Flanged 12.37
(314)		 7.31
(186)		 7.38
(187)		 1.81
(46.0)		 6.00
(152)		 0.75
(19.1)		 6 lb
(2.7 kg)
 
 
K52 Performance Curves
 
 
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Safe Water Technologies, Inc.
996 Bluff City Boulevard
Elgin, IL 60120 USA
 
tele: +1.847.888.6900
 fax: +1.847.888.6924
email: info@swtwater.com
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Last Updated: August 4, 2025