The "Gold Standard" For Controlling Water Flow In HVAC Systems

Hays' patented Mesurflo« automatic flow control valves 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. Unlike other control valves which can be noisy and clog easily, Mesurflo« offers you these significant benefits:

  • Eliminates oscillation, vibration, noise and feedback in the system

  • Non-clogging design that can be backwashed for easy cleaning

  • Maintains proper flow rate for high efficiency of the coil

  • Reduces the number of valves required to balance the system

  • Eliminates the high cost of testing and balancing

  • Additional devices may be added without affecting the system balance

  • Accuracy provides 99.8% heat transfer

Mesurflo« automatic flow control valves 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.

Mesurflo« Gold Standard Booklet | More Hays Automatic Flow Control Valves

Model 2510 Mesurflo® Automatic Balancing Valve

Model 2510 Mesurflo« Automatic Balancing Valves

Model 2510 Mesurflo® Automatic Balancing Valve

  • FNPT and MNPT Inlet / Outlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • 1/4" Pressure / Temperature Ports

  • Dryseal Pipe Threads

  • Valve Body Suitable for 600 PSIG

  • Valves Labeled with Model No., Size & Flow Rate

Model 2510 Mesurflo® Automatic Balancing Valve
(DN15 - 1/2 in., DN20 - 3/4 in. & DN25 - 1 in.)

  • Metric Adapters per ISO 7-1 Standards

  • Female and Male Inlet / Outlet 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) 23-34 LPM (5.5-9.0 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF)

  • Pressure / Temperature Ports

  • Valve Body Suitable for 4137 kPa (600 PSIG)

  • Valves Labeled with Model No., Size & Flow Rate

2510 Installation and Operation Manual

Model 2511 Mesurflo® Automatic Balancing Valve

Model 2511 Mesurflo« Automatic Balancing Valves

Model 2511 Mesurflo® Automatic Balancing Valve

  • FSWT Inlet / Outlet Connections

  • Differential Operating Pressure:
    2-80 PSID 0.50-8.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to225ºF

  • Available in 4" or 5-1/2" Lengths

  • Valve Body Suitable for 522 PSIG

Model 2511 Mesurflo® Automatic Balancing Valve
(DN15 - 1/2 in. & DN20 - 3/4 in.)

  • Sweat Inlet / Outlet Connections

  • 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) 23-34 LPM (5.5-9.0 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF)

  • Available in 101.6 MM (4") or 139.7 MM (5-1/2") Lengths

  • Valve Body Suitable for 3599 kPa (522 PSIG)

  • Valves Labeled with Model No., Size & Flow Rate

2511 Installation and Operation Manual

Model 2513 Mesurflo® Automatic Balancing Valve

Model 2513 Mesurflo« Automatic Balancing Valves

Model 2513 Mesurflo® Automatic Balancing Valve

  • 1/2", 3/4" & 1" FSWT Inlet / Outlet Connections

  • 3/4" Female & Male Garden Hose Inlet / Outlet Connections

  • 1/2" & 3/4" FNPT & MNPT Inlet / Outlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • Dryseal Pipe Threads

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 600 PSIG

Model 2513 Mesurflo® Automatic Balancing Valve
(DN15 - 1/2 in., DN20 - 3/4 in. & DN25 - 1 in.)

  • Metric Adapters per ISO 7-1 Standards

  • Female, Male, & Sweat Inlet / Outlet 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) 23-34 LPM (5.5-9.0 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF)

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 4137 kPa (600 PSIG)

2513 Installation and Operation Manual

Model 2514 Mesurflo® Automatic Balancing Valve

Model 2514 Mesurflo« Y-Ball Automatic Balancing Valves

Model 2514 Mesurflo® Y-Ball Automatic Balancing Valve

  • FNPT, FSWT and MNPT Outlet / Inlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 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 2514 Mesurflo® Y-Ball Automatic Balancing Valve
(DN15 - 1/2 in., 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) 23-34 LPM (5.50-9.00 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)

Model 2514
2514 Installation and Operation Manual

2515 Image

Model 2515 Mesurflo« Y-Ball Automatic Balancing Valves

2515 Spec Sheet

2515 Installation and Operation Manual

Standard Features:

  • FNPT, FSWT and MNPT Outlet / Inlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • 1/4" Pressure / Temperature Ports

  • Short or Lever Handle

  • Inlet and Outlet Port Options

  • Valves Labeled with Model No., Size & Flow Rate

  • Dryseal Pipe Threads

  • Valve Body Suitable for 600 PSIG

Model 2516 Mesurflo® Y-Ball Automatic Balancing Valve

Model 2516 Mesurflo« Y-Ball Automatic Balancing Valves

Model 2516 Mesurflo® Y-Ball Automatic Balancing Valve

  • FNPT, FSWT and MNPT Outlet / Inlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • 1/4" Pressure / Temperature Ports

  • Short or Lever Handle

  • Inlet and Outlet Port Options

  • Valves Labeled with Model No., Size & Flow Rate

  • Dryseal Pipe Threads

  • Valve Body Suitable for 600 PSIG

Model 2516 Mesurflo® Y-Ball Automatic Balancing Valve
(DN15 - 1/2 in., 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) 23-34 LPM (5.5-9.0 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225 ºF)

  • Pressure / Temperature Ports

  • Short or Lever Handle

  • Inlet and Outlet Port Options

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 4137 kPa (600 PSIG)

2516 Installation and Operation Manual

Model 2517 Mesurflo® Y-Ball Automatic Balancing Valve

Model 2517 Mesurflo« Y-Ball Automatic Balancing Valves

Model 2517 Mesurflo® Y-Ball Automatic Balancing Valve

  • FSWT Outlet / Inlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-5.00 GPM
    3-80 PSID 5.50-9.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 600 PSIG

Model 2517 Mesurflo® Y-Ball Automatic Balancing Valve
(DN15 - 1/2 in. & DN20 - 3/4 in.)

  • 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) 23-34 LPM (5.50-9.0 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF)

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 4137 kPa (600 PSIG)

2517 Installation and Operation Manual

Model 2518 Mesurflo® Y-Ball Automatic Balancing Valve w/ISO 5211 Actuator Pad

Model 2518 Mesurflo« Y-Ball Automatic Balancing Valve
w/ISO 5211 Actuator Pad

2518 Installation and Operation Manual

Standard Features:

  • FNPT, FSWT and MNPT Outlet / Inlet Connections

  • Union Inlet

  • 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 32║F to 225║F

  • 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

Model 2519 Mesurflo® Y-Ball Automatic Balancing Valve

Model 2519 Mesurflo« Y-Ball Automatic Balancing Valves

Model 2519 Mesurflo® Y-Ball Automatic Balancing Valve

  • FNPT, FSWT and MNPT Outlet / Inlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure:
    2-80 PSID 0.50-3.00 GPM
    3-80 PSID 3.50-5.00 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32ºF to 225ºF

  • 1/4" Pressure / Temperature Ports

  • Inlet and Outlet Port Options

  • Short Handle

  • Valves Labeled with Model No., Size & Flow Rate

  • Dryseal Pipe Threads

  • Weighs between 1.2 - 1.5 lbs.

  • Suitable for 600 PSIG

Model 2519 Mesurflo® Y-Ball Automatic Balancing Valve
(DN15 - 1/2 in. & DN20 - 3/4 in.)

  • Metric Adapters per ISO 7-1 Standards

  • Female, Male and Sweat Outlet / Inlet Connections

  • DN 20 Union Ends

  • Changeable Flow Cartridges

  • Differential Operating Pressure Range:
    14 - 552 kPa (2-80 PSID) 1.9-11.4 LPM (0.50-3.00 GPM)
    21 - 552 kPa (3-80 PSID) 13.3-19 LPM (3.50-5.00 GPM)

  • ± 10% Accuracy

  • Operating Temperature Range 0ºC to 107ºC (32ºF to 225ºF)

  • Pressure / Temperature Ports

  • Inlet and Outlet Port Options

  • Short Handle

  • Valves Labeled with Model No., Size & Flow Rate

  • Weighs between 0.25 - 0.32 kg (0.55-0.7 lbs)

  • Suitable for 4137 kPa (600 PSIG)

2519 Installation and Operation Manual

Model 2520 Mesurflo® Automatic Balancing Valve (3/4 in., 1 in., 1-1/4 in. & 1-1/2 in.)

Model 2520 Mesurflo« Automatic Balancing Valves

Model 2520 Mesurflo® Automatic Balancing Valve
(3/4 in., 1 in., 1-1/4 in. & 1-1/2 in.)

  • FNPT and MNPT Inlet Connections

  • FNPT, FSWT and MNPT Outlet Connections

  • Changeable GPM Flow Cartridges

  • Differential Operating Pressure
    2-80 PSID Range 0.50 - 5.00 GPM
    3-80 PSID Range 5.50 - 17.0 GPM
    5-80 PSID Range 18.0 - 25.0 GPM

  • ± 10% Accuracy

  • Operating Temperature Range 32º F to 225º F

  • 1/4" Pressure / Temperature Ports

  • Valves Labeled with Model No., Size & Flow Rate

  • Dryseal Pipe Threads

  • Valve Body Suitable for 600 PSIG

Model 2520 Mesurflo® Automatic Balancing Valve
(DN20 - 3/4 in. & DN25 - 1 in.)

  • Metric Adapters per ISO 7-1 Standards

  • Female and Male Inlet Connections

  • Female, Sweat and Male Outlet 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 225ºF)

  • Pressure / Temperature Ports

  • Valves Labeled with Model No., Size & Flow Rate

  • Valve Body Suitable for 4137 kPa (600 PSIG)

2520 Installation and Operation Manual

Model 2521 Mesurflo® Automatic Balancing Valve

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

More Hays Automatic Flow Control Valves