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FB31 Series Shutter Type Flow Switch

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Sample Application
Technical Support
Hotline:021-54430662

Introduction

Principle & Structure

Mechanical flow switch. The built-in spring-supported baffle, when the flow reaches the preset value, the mechanical structure triggers the micro-trigger switch.

Features

In-line installation, minimal pressure loss, good repeatability, anti-fouling ability, and precise switch setting through the knob. The mechanical part is safely isolated from the electronic part.

application

Gas-liquid dual-use type, industrial automation/mechanical equipment/air compression industry/refrigeration and air-conditioning is suitable for pipes with a diameter of ≤50mm.

Performance overview

Flow switch, brass (stainless steel) body. Internal components such as baffles, bellows, and support frames are stainless steel. Applicable medium: water, glycol solution, oil, air. Maximum working pressure 40 bar. Medium temperature -30…350℃. Power supply: 250V, 3A. Protection level IP54. Applicable pipe diameter DN15~DN50

technical parameter

Predetermined area: See the table below for details Protection class: IP54
Repeatability: ±2.5% of total scale Main material: 316L stainless steel
Wiring: Terminal wiring Process connection: Brass Alloy & 316L Stainless Steel
output: Mechanical switch normally open + normally closed (24VDC, 15A/250VAC, 15A/380VAC, 5A) Connecting rod: Brass Alloy & 3161L Stainless Steel
Pressure: 16 bar (40 bar optional) File: 316L stainless steel
Average pressure loss: 0.08bar (maximum flow) seal: NBR
Ambient temperature: -25…80℃ Protective case: Fire Grade Carbonated Polymer & 316L Stainless Steel
Medium temperature: 0…90℃ (-30…350℃)

Pipe diameter Interface thread model Pressure resistance Adjustable range Hysteresis weight
DN D bar L/min (pure water) L/min (pure water) kg
15 RC 1/2″ Tapered Pipe Thread FB31-015FM1 16 or 40 3…11 1.5 0.85
RC 1/2″ Tapered Pipe Thread FB31-015FM2 5…17 2.5
20 RC 3/4″ Tapered Pipe Thread FB31-020FM1 4.2…18 2
RC 3/4″ Tapered Pipe Thread FB31-020FM2 8.3…37 3
25 RC 1″ Taper Pipe Thread FB31-025FM1 5…23 2
RC 1″ Taper Pipe Thread FB31-025FM2 11…48 4
32 RC 1 1/4″ Tapered Pipe Thread FB31-032FM1 8.1…39 3 1.1
RC 1 1/4″ Tapered Pipe Thread FB31-032FM2 19…90 6
40 RC 1 1/2″ Tapered Pipe Thread FB31-040FM1 15…69 5
RC 1 1/2″ Tapered Pipe Thread FB31-040FM2 25…111 7
50 RC2″ Taper Pipe Thread FB31-050FM1 35…92 6 1.25
RC 2″ Taper Pipe Thread FB31-050FM2 46…125 7

Note: The above parameters are obtained by installing the switch vertically in a horizontal pipeline and testing with 20°C water as the medium. The switch material of the above model example is 316L stainless steel (and bronze material is optional)

Selection table

FB31-	Baffle flow switch
	Applicable pipe diameter
	015	RC 1/2" Tapered Pipe Thread (DN15)
	020	RC 3/4" Tapered Pipe Thread (DN20)
	025	RC 1" Tapered Pipe Thread (DN25)
	032	RC 1 1/4" Tapered Pipe Thread (DN32)
	040	RC 1 1/2" Tapered Pipe Thread (DN40)
	050	RC2" Tapered Pipe Thread (DN50)
	A	Customer-specified pipe diameter
		Connection method
		F	internal thread
		M	External thread
			Material Description
			M	Brass alloy construction UNI EN 12165 CW617N
			K1	Stainless steel 1.4301(304) Liquid body
			K2	Stainless steel 1.4435 (316L) liquid body
				specification
				1	For details, please refer to the adjustment range of the range suitable for the pipe diameter in the parameter table 1.
				2	For details, please refer to the adjustment range of the range suitable for the pipe diameter in the parameter table 1.
					Protective cover material
					P	Fire-grade carbonated polymer enclosure (IP54)
					A	Die-cast aluminum enclosure (IP67)
					K	316L stainless steel enclosure (IP54)
							(special option) VARIO
							/F	Special connection method: flange connection
							/HP	High pressure 25bar
							/HT	High temperature resistance 350°C (protection level of this option is IP67)
The complete data of this selection table, please contact the sales staff or email to sales@kewill-auto.cn for complete samples.

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Predetermined area:	See the table below for details	Protection class:	IP54
Repeatability:	±2.5% of total scale	Main material:	316L stainless steel
Wiring:	Terminal wiring	Process connection:	Brass Alloy & 316L Stainless Steel
output:	Mechanical switch normally open + normally closed (24VDC, 15A/250VAC, 15A/380VAC, 5A)	Connecting rod:	Brass Alloy & 3161L Stainless Steel
Pressure:	16 bar (40 bar optional)	File:	316L stainless steel
Average pressure loss:	0.08bar (maximum flow)	seal:	NBR
Ambient temperature:	-25…80℃	Protective case:	Fire Grade Carbonated Polymer & 316L Stainless Steel
Medium temperature:	0…90℃ (-30…350℃)