(a) No person may divert or impound the natural flow of surface waters in this state, or permit a diversion or impounding by him to continue, in a manner that damages the property of another by the overflow of the water diverted or impounded. To keep water hammer low, pipe-sizing charts for some applications recommend flow velocity at or below 1.5 m/s (4.9 ft/s) Fit slowly closing valves. Toilet fill valves are available in a quiet fill type that closes quietly. Non-slam check valves do not rely on fluid flow to close and will do so before the water flow reaches significant velocity.
Features and Benefits Ytd music.
- Universal design serves the widest variety of applications
- For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others
- Replacement for common flow switches from Johnson/Penn, Potter/Taco, Watts, Hydrolevel and other manufacturers
- 1″ NPT
- Two electrical knock-outs allows connection from either end
- Sensitivity adjusting screw makes flow adjustment easy
- Single pole, double throw snap switch
- Hardened stainless steel bearings minimize friction
- Sealed Monel bellows
- Four stainless steel paddles included -1″, 2″, 3″ & 6″ (25, 50, 80, & 150mm)
![Liquid Flow 11 Liquid Flow 11](https://miro.medium.com/max/1400/1*8V1j1NklK9tfwRJF2ClrlQ.jpeg)
Optional Features
- Two SPDT switches to make or break two separate circuits
- Materials of construction suitable for corrosive liquids
- BSPT threads
- Minimum temperature (fluid or ambient) 32°F (0°C)
- Maximum temperature 300°F (149°C)
- Maximum pressure 160 psi (11.3 kg/cm2)
Catalogs
- 9 MB
Installation/Operation Manuals
- 5 MB
- 347 KB
Parts Lists
- 6 MB
How to Buy
McDonnell & Miller
McDonnell & Miller is a leader in engineering and manufacturing boiler controls, liquid level controls, low-water cutoffs, and flow switches for steam and hot water boilers in industrial, commercial, and building trades applications.
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Calculator
Liquid Flow Science
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Fluid Flow Calculator
by Michael J. Rocchetti PE
Mechanical Engineer
by Michael J. Rocchetti PE
Mechanical Engineer
This calculator is used to calculate pipe friction losses for straight piping handling water and water with varying percentages of ethylene glycol. The calculator uses an algorithm developed from the basic principles of fluid mechanics. The program is based on the Darcy-Weisbach equation, the Colebrook equation, and the Moody equation. The program is intended for use only on straight piping. The program does not include pressure losses due to elevation differences, or flow through fittings.
This calculator allows you to input the fluid type, the fluid temperature, the flow rate, the pipe size, pipe length, and pipe material. The calculator then determines the velocity, the Reynolds number, the Moody friction factor, the pipe friction factor (from the Colebrook equation), the pipe head loss, and the pipe friction loss in PSI. This calculator is intended for use on systems handling water and water with varying percentages of ethylene glycol.
Please note that this method works for turbulent flow situations where the Reynolds Number is greater than 3000. If you find that your Reynolds number is less than 3000, you should revise your input parameters (increase the flow rate and/or reduce the pipe size).
Additional Design Criteria: If your piping is being used in an open loop system, flow velocities should be in the range of 5 to 10 ft/sec. For closed loop piping systems, you should use a 4 ft/sec limit for piping of 2' or less. For larger pipe sizes, use a limit of 4 FT of head loss per 100 FT of pipe.
Liquid Flow Sensor
References:
Liquid Flow 11 3
- Fluid Mechanics and its applications by James W Murdock, PE
Houghton Mifflin Co. - Heating Ventilating and Air Conditioning Analysis and Design
by Faye C. McQuiston and Jerald D. Parker
John Wiley & Sons. - Flow of Fluids Through Valves, Fittings, and Pipe
Technical Paper No. 410
The Crane Company - ASHRAE Fundamentals 1993
The American Society of Heating Refrigerating and Air Conditioning Engineers