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Mesurflo® Automatic Flow Control Valves From Hays Fluid Controls have been called the "Gold Standard" because their unique features and benefits make them the ideal solution for controlling flow in waterbased cooling and heating systems.
Mesurflo® Automatic Flow Control Valves From Hays Fluid Controls are now available with flow rates up to 9.00 GPM in the small brass body designs. Previously all 9.00 GPM applications required the use of the large brass body designs such as models 2520 and 2524. Now, nearly 90% of 9.00 GPM applications can utilize the small brass body valves, models 2510, 2514, 2516, 2519 and 2517. This is approximately a 50% reduction in brass for 9.0 GPM applications, resulting in substantial cost savings to you.
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Hays Automatic Balancing Valves
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Model 2521 Mesurflo® Automatic Balancing Valves
Model 2521 Mesurflo® Automatic Balancing Valve
FSWT Inlet / Outlet Connections Differential Operating Pressure:
3-80 PSID 9.0-17.0 GPM
5-80 PSID 18.0-25.0 GPM ± 10% Accuracy Operating Temperature Range 32ºF to225ºF Valves Labeled with Model No., Size & Flow Rate Valve Body Suitable for 522 PSIG
Model 2521 Mesurflo® Automatic Balancing Valve
(DN20 - 3/4 in. & DN25 - 1 in.)
Sweat Inlet / Outlet Connections Differential Pressure Operating Range:
21 - 552 kPa (3-80 PSID) 34-64 LPM (9.00-17.0 GPM)
34 - 552 kPa (5-80 PSID) 68-95 LPM (18.0-25.0 GPM) ± 10% Accuracy Operating Temperature Range 0ºC to 107ºC (32ºF to 225º F) Valve Length 152.4 MM (6") Valves Labeled with Model No., Size & Flow Rate Valve Body Suitable for 3599 kPa (522 PSI)
2521 Installation and Operation Manual
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Model 2524 Mesurflo® Y-Ball Automatic Balancing Valves
Model 2524 Mesurflo® Y-Ball Automatic Balancing Valve
(3/4 in., 1 in., 1-1/4 in. & 1-1/2 in.)
FNPT, FSWT and MNPT Outlet / Inlet Connections Changeable GPM Flow Cartridges Differential Operating Pressure:
2-80 PSID 0.5-5.00 GPM
3-80 PSID 5.50-17.0 GPM
5-80 PSID 18.0-25.0 GPM ± 10% Accuracy Operating Temperature Range 32ºF to 225ºF 1/4" Pressure / Temperature Ports Short or Lever Handle Right or Left Hand Porting Inlet and Outlet Port Options Valves Labeled with Model No., Size & Flow Rate Dryseal Pipe Threads Valve Body Suitable for 600 PSIG
Model 2524 Mesurflo® Y-Ball Automatic Balancing Valve
(DN20 - 3/4 in. & DN25 - 1 in.)
Metric Adapters per ISO 7-1 Standards Female, Male and Sweat Outlet / Inlet Connections Changeable Flow Cartridges Differential Operating Pressure Range:
14 - 552 kPa (2-80 PSID) 1.9-19 LPM (0.50-5.00 GPM)
21 - 552 kPa (3-80 PSID) 23-64 LPM (5.50-17.0 GPM)
34 - 552 kPa (5-80 PSID) 68-95 LPM (18.0-25.0 GPM) ± 10% Accuracy Operating Temperature Range 0ºC to 107ºC (32ºF to 225º F) Pressure / Temperature Ports Short or Lever Handle Right or Left Hand Porting Inlet and Outlet Port Options Valves Labeled with Model No., Size & Flow Rate Valve Body Suitable for 4137 kPa (600 PSIG)
2524 Installation and Operation Manual
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Model 2528 Mesurflo® Y-Ball Automatic Balancing Valve
(Use w/Pop-Top Actuator)
Model 2528
2528 Installation and Operation Manual
Standard Features:
FNPT, FSWT, MSWT and MNPT Outlet / Inlet Connections
Changeable GPM Flow Cartridges
Differential Operating Pressure: At low differential pressure the flow area required to achieve higher flow exceeds the flow area available for the respective Series. Therefore, the minimum pressure differential requirement is increased for the higher flow ranges of some series Mesurflo valves.
± 10% Accuracy
Operating Temperature Range 32ºF to 225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Inlet and Outlet Port Options
Dryseal Pipe Threads
Weighs between 1.2 - 1.5 lbs. without the actuator
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Model 2530 Mesurflo® Automatic Balancing Valves
Model 2530 Mesurflo® Automatic Balancing Valve
(1 in., 1-1/4 in. & 1-1/2 in.)
FNPT Inlet/Outlet Connections 1 GPM Increments Changeable GPM Flow Cartridges Differential Operating Pressure
3-80 PSID 9.0-17.0 GPM
5-80 PSID 18.0-75.0 GPM ± 10% Accuracy Operating Temperature Range 32ºF to 225ºF 1/4" Pressure / Temperature Ports Valves Labeled with Model No., Size & Flow Rate Dryseal Pipe Threads Valve Body Suitable for 400 PSIG
Model 2530 Mesurflo® Automatic Balancing Valve
(DN25 - 1 in.)
Metric Adapters per ISO 7-1 Standards Female Inlet/Outlet Connections 3.8 LPM (1 GPM) Increments Changeable Flow Cartridges Differential Operating Pressure Range:
21 - 552 kPa (3-80 PSID) 34-64 LPM (9.00-17.0 GPM)
34 - 552 kPa (5-80 PSID) 68-246 LPM (18.0-65.0 GPM) ± 10% Accuracy Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF) Pressure / Temperature Ports Valves Labeled with Model No., Size & Flow Rate Valve Body Suitable for 2758 kPa (400 PSIG)
2530 Installation and Operation Manual
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Model 2535 Mesurflo® Automatic Balancing Valve
(2 in. & 2-1/2 in.)
2535 Installation and Operation Manual
Standard Features:
FNPT Inlet/Outlet Connections
1 GPM Increments
Changeable GPM Flow Cartridges
Differential Operating Pressure
3-80 PSID 9.0-17.0 GPM
5-80 PSID 18.0-100.0 GPM
± 10% Accuracy
Operating Temperature Range 32ºF to 225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Dryseal Pipe Threads
Valve Body Suitable for 400 PSIG
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Model 2540 Mesurflo® Automatic Balancing Valve
(2 in., 2-1/2 in. & 3 in.)
2540 Installation and Operation Manual
Standard Features:
FNPT Inlet/Outlet Connections
5 GPM Increments
Changeable GPM Flow Cartridges
Differential Operating Pressure
5-80 PSID 40-200 GPM
± 10% Accuracy
Operating Temperature Range 32ºF to 225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Dryseal Pipe Threads
Valve Body Suitable for 400 PSIG
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Model 2545 Mesurflo® Automatic Balancing Valve
(2 in., 2-1/2 in., 3 in. & 4 in.)
2545 Installation and Operation Manual
Standard Features:
Flanged Inlet/Outlet Connections
1 gpm Increments 9.0-100 gpm
5 gpm Increments 105-225 gpm
Flow Cartridges are Not Changeable
Valve is Hermetically Sealed
Differential Operating Pressure
5-80 PSID
± 10% Accuracy
Class 150 Flanges
Operating Temperature Range 32ºF to 225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
4 Bolt Flange on 2"-3" Valves
8 Bolt Flange on 4" Valves
Valve Body Suitable for 400 PSIG
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Model 2546 - Welded Mesurflo® Automatic Balancing Valve
(6 in., 8 in., 10 in. & 12 in.)
2546 Installation and Operation Manual
Standard Features:
Welded Connections
25 GPM Increments
Differential Operating Pressure
5-80 PSID
± 10% Accuracy
Operating Temperature Range 32ºF to225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Valve Body Suitable for 400 PSIG
Length changes as flow rates are increased
Hooks attached for ease of handling for installation placement
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Model 2547 - Flanged Mesurflo® Automatic Balancing Valve
(6 in., 8 in., 10 in. & 12 in.)
2547 Installation and Operation Manual
Standard Features:
Flanged Connections
25 GPM Increments
Differential Operating Pressure
5-80 PSID
± 10% Accuracy
Operating Temperature Range 32ºF to225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Valve Body Suitable for 400 PSIG
Flange Rating: 150 lb.
Length changes as flow rates are increased
Hooks attached for ease of handling for installation placement
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Model 2548 - Grooved Mesurflo® Automatic Balancing Valve
(6 in., 8 in., 10 in. & 12 in.)
2548 Installation and Operation Manual
Standard Features:
Welded Connections
25 GPM Increments
Differential Operating Pressure
5-80 PSID
± 10% Accuracy
Operating Temperature Range 32ºF to225ºF
1/4" Pressure / Temperature Ports
Valves Labeled with Model No., Size & Flow Rate
Valve Body Suitable for 400 PSIG
Length changes as flow rates are increased
Hooks attached for ease of handling for installation placement
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Model 2570 Mesurflo® Automatic Balancing Valve
(14 in., 16 in., 18 in., 20 in., 24 in., 30 in. & 36 in.)
2570 Installation and Operation Manual
Standard Features:
Flanged Outlet Connections >25 GPM Increments Differential Operating Pressure
5-80 PSID Where Not Limited By Application ± 10% Accuracy Operating Temperature Range 32º to 225ºF 1/8" Extended Pressure / Temperature Ports Valves Labeled with Model No., Size & Flow Rate Valve Body Suitable for 400 PSIG >Standard Flanges Per ANSI B16.5 Flange Rating: 150 lb.
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