PEECO Low Flow Switches

PEECO low flow switches are designed to perform under conditions other switches can’t touch. Our low flow switches can detect flow rates of less than 0.01 GPM reliably and with repeatability.

Adjustable paddle from half to full diameter. Easily changed to accommodate flow/media changes, half-full lines, fluid separation, etc.
Extremely sensitive unit designed for minimum actuation.
Available in explosion and non-explosion proof models in screwed of wafer tees. Recommended for line sizes up to 2″ inclusive.
These units – designed for extreme sensitivity — allow full flow with minimal pressure drop. Flows of less than 0.01 GPM can be reliably detected.
Low flows of gases require a special feature to compensate for chatter created by the compressibility of gas. This is accomplished by introducing a constantly expanding taper on the inlet side, so when the paddle moves the gas expands uniformly.

FOLDING PADDLE

Utilizing a helical-wound Inconel spring, this design permits extremely low flow actuation without impeding media passage at high velocities -such as found on flare gas stacks.

PEECO Flow Rate and Pressure Drop Information

* Minimum Flow Rate Required For Actuation By H2O & GN²
I = Increasing Flow | D = Decreasing Flow | P = Pressure Drop In PSI
All Flow Switches Were Tested At 100 psi and 300 psi. Standard Units with a 15A -125-250-480 VAC SPDT Micro-Switch. Lower actuation points can be reached using our special folding paddle.

Line Size 1/4 to 3/4 inches

PIPELINE SIZE	FLOW	GPM (H20)	PRESS DROP	SCFM (GN2)	PRESS DROP
1/4" STD	INCREASING	1.174	4.72 PSI	6.62	1.54 PSI
1/4" STD	DECREASING	1.155	4.39 PSI	4.20	0.65 PSI
1/4" LOW FLOW	INCREASING	0.148	4.59 PSI	LESS THAN 0.05	0.43 PSI
1/4" LOW FLOW	DECREASING	0.13	4.58 PSI	LESS THAN 0.05	0.425 PSI
1/4" LOW-LOW FLOW	INCREASING	LESS THAN 0.05	6.39 PSI	LESS THAN 0.05	0.425 PSI
1/4" LOW-LOW FLOW	DECREASING	LESS THAN 0.05	8.84 PSI	LESS THAN 0.05	0.425 PSI
1/2" STD	INCREASING	1.94	0.64 PSI	8.9	0.5 PSI
1/2" STD	DECREASING	1.66	0.60 PSI	8.0	0.5 PSI
1/2" LOW FLOW	INCREASING	0.22	0.7 PSI	LESS THAN 0.04	0.798 PSI
1/2" LOW FLOW	DECREASING	0.20	0.7 PSI	LESS THAN 0.04	0.735 PSI
1/2" LOW-LOW FLOW	INCREASING	LESS THAN 0.01	1.15 PSI	LESS THAN 0.04	0.798 PSI
1/2" LOW-LOW FLOW	DECREASING	LESS THAN 0.01	1.13 PSI	LESS THAN 0.04	0.70 PSI
3/4" STD	INCREASING	3.14	0.06 PSI	13.9	0.07 PSI
3/4" STD	DECREASING	2.42	0.06 PSI	11.42	0.07 PSI
3/4" LOW FLOW	INCREASING	0.599	0.8 PSI	5.37	0.036 PSI
3/4" LOW FLOW	DECREASING	0.599	0.8 PSI	4.67	0.036 PSI
3/4" LOW-LOW FLOW	INCREASING	0.01	1.22 PSI	LESS THAN 0.05	0.036 PSI
3/4" LOW-LOW FLOW	DECREASING	0.01	1.22 PSI	LESS THAN 0.05	0.036 PSI
PIPELINE SIZE	FLOW	GPM (H20)	PRESS DROP	SCFM (GN2)	PRESS DROP

Line Size 1 to 2 inches

PIPELINE SIZE	FLOW	GPM (H20)	PRESS DROP	SCFM (GN2)	PRESS DROP
1" STD	INCREASING	3.2	0.06 PSI	23.63	0.07 PSI
1" STD	DECREASING	2.5	0.06 PSI	19.41	0.07 PSI
1" LOW FLOW	INCREASING	0.655	0.785 PSI	9.129	0.036 PSI
1" LOW FLOW	DECREASING	0.64	0.78 PSI	7.939	0.036 PSI
1" LOW-LOW FLOW	INCREASING	LESS THAN 0.01	1.15 PSI	LESS THAN 0.03	0.03 PSI
1" LOW-LOW FLOW	DECREASING	LESS THAN 0.01	1.1 PSI	LESS THAN 0.03	0.03 PSI
1-1/2" STD	INCREASING	3.44	0.72	26.0	0.07
1-1/2" STD	DECREASING	3.40	0.72	23.8	0.05
1-1/2" LOW FLOW	INCREASING	0.756	1.2	LESS THAN 1.0	0.78
1-1/2" LOW FLOW	DECREASING	0.755	1.2	LESS THAN 1.0	0.67
1-1/2" LOW LOW FLOW	INCREASING	0.314	1.7	LESS THAN 1.0	1.1
1-1/2" LOW LOW FLOW	DECREASING	0.313	1.7	LESS THAN 1.0	0.93
2" STD	INCREASING	5.98	0.7 PSI	35.4	0.07 PSI
2" STD	DECREASING	5.8	0.68 PSI	32.8	0.07 PSI
2" LOW FLOW	INCREASING	0.76	1.2 PSI	LESS THAN 1.0	0.70 PSI
2" LOW FLOW	DECREASING	0.75	1.2 PSI	LESS THAN 1.0	0.61 PSI
2" LOW-LOW FLOW	INCREASING	0.32	1.9 PSI	LESS THAN 1.0	0.94 PSI
2" LOW-LOW FLOW	DECREASING	0.32	1.9 PSI	LESS THAN 1.0	0.86 PSI
PIPELINE SIZE	FLOW	GPM (H20)	PRESS DROP	SCFM (GN2)	PRESS DROP