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Deltrol Fluid Products

Flow Controls

Pressure Compensated Constant Flow Valves

Pneu-Trol Pressure Compensated Constant Flow Valves are exceptionally accurate in maintaining constant flow with pressures up to 3,000 PSI (207 bar). Non-adjustable units (Series 4) provide exact factory-set output gallonage, regardless of inlet pressure up to rated limits. Adjustable valves (Series 5) permit infinite adjustment of output gallonage independent of inlet pressure, and may be adjusted under pressure. Series 3 is a new miniature 1/4" valve for smaller flow rates. Series 4 and 5 Pneu-Trol Pressure Compensated Valves feature free reverse flow, which allows a maximum return flow with minimum pressure drop.
 
The compensating action of these valves results from a fixed diameter orifice or an adjustable orifice at the intake end and a series of variable orifices at the output end. Flow through the variable orifices is controlled by a spring and piston. These elements - the spring and piston - work together to regulate hydraulic flow within the determined rates. Flows are controlled within ±15% up to 1.5 GPM (5.7 bar) and ±10% at higher flow rates up to 30 GPM (114 bar). Regulation is virtually unaffected by fluid temperature changes from 60°F (16°C) to 180°F (82°C) (at a temperature differential [ΔT] of 70°F (21°C) flow variation is ±2% max; at a temperature differential [ΔT] of 120°F (49°C) flow variation is ±4% max).
 
Units are made of high-strength steel. Ports are tapped with NPTF threads. On special order, these valves can be supplied with ports threaded to MS specification. Port sizes not listed also may be provided. Consult Flo-Products Sales.
 

 
Series 3 Series 4
1/4" 1/4" 3/8" 1/2"
GPM L/min GPM L/min GPM L/min GPM L/min
0.10
0.15
0.20
0.30
0.40
0.50
0.60		 0.38
0.57
0.76
1.14
1.51
1.89
2.27		 0.50
0.75
0.90
1.00
1.25
1.30
1.50		 1.89
2.84
3.41
3.79
4.73
4.92
5.68		 1.00
1.20
1.50
2.00
2.25
2.50
3.00		 3.79
4.54
5.68
7.57
8.52
9.46
11.36		 1.50
3.00
3.50
3.75
4.00
4.50
5.00		 5.68
11.36
13.25
14.19
15.14
17.03
18.93
0.75
1.00
1.25
1.50
1.75
2.00		 2.84
3.79
4.73
5.68
6.62
7.57		 1.75
2.00
2.50
2.80
3.00
3.50		 6.62
7.57
9.46
10.60
11.36
13.25		 3.25
3.50
4.00
5.00
6.00
6.25		 12.30
13.25
15.14
18.93
22.71
23.66		 5.50
6.00
7.00
7.50
8.50
9.00		 20.82
22.71
26.50
28.39
32.17
34.07
    4.00
5.00
 
 
 
 		 15.14
18.93
 
 
 
 		 7.00
8.00
9.00
10.00
 
 		 26.50
30.28
34.07
37.85
 
 		 10.00
11.00
12.00
13.00
14.00
15.00		 37.85
41.64
45.42
49.21
52.99
56.78

 
Series 3 - Miniature Fixed, No Free Reverse
Length Width Size & Thread Part Number Range GPM (L/min) Min. Oper. Pres (ΔP)
2-3/8" (60.5) 11/16" (17.5) Hex 1/4" NPTF PC3-2-GPM .10 to 2.0 (.38 to 7.57) 100 (6.9 bar)
SAE-6 PC632-GPM .10 to 2.0 (.38 to 7.57) 100 (6.9 bar)
Series 4 - Fixed with Free Reverse
Length Width Size & Thread Part Number Range GPM (L/min) Min. Oper. Pres (ΔP)
3-3/16" (81.0) 1" (25.5) 1/4" NPTF PC4-2-GPM .50 to 5 (1.9 to 19) 100-300 (6.9-10.7 bar)
3-3/4" (95.0) 1-3/8" (35.0) 3/8" NPTF PC4-3-GPM 1 to 10 (3.8 to 38) 100-200 (6.9-13.8 bar)
4-3/8" (111.0) 1-1/2" (38.0) 1/2" NPTF PC4-4-GPM 1.5 to 15 (5.7 to 57) 200 (13.8 bar)
SAE-8 PC844-GPM .10 to 2.0 (.38 to 7.57) 100 (6.9 bar) 1.5 to 15 (5.7 to 57) 200 (13.8 bar)
Series 5 - Adjustable with Free Reverse
Length Width Size & Thread Part Number Range GPM (L/min) Min. Oper. Pres (ΔP)
3-3/16" (81.0) 1-1/8" (28.5) 1/4" NPTF PC5-2 .50 to 5 (1.9 to 19) 100-300 (6.9-10.7 bar)
3-3/4" (95.0) 1-1/2" (38.0) 3/8" NPTF PC5-3 1 to 10 (3.8 to 38) 100-200 (6.9-13.8 bar)
4-3/8" (111.0) 1-5/8" (41.5) 1/2" NPTF PC5-4 1.5 to 15 (5.7 to 57) 200 (13.8 bar)
3-3/16" (81.0) 1-1/8" (28.5) 1/4" BSPT PCB5-2 .50 to 5 (1.9 to 19) 100-300 (6.9-10.7 bar)
3-3/4" (95.0) 1-1/2" (38.0) 3/8" BSPT PCB5-3 1 to 10 (3.8 to 38) 100-200 (6.9-13.8 bar)
4-3/8" (111.0) 1-5/8" (41.5) 1/2" BSPT PCB5-4 1.5 to 15 (5.7 to 57) 200 (13.8 bar)
3-3/4" (95.0) 1-1/2" (38.0) SAE-8 PCM-853 1 to 10 (3.8 to 38) 100-200 (6.9-13.8 bar)
4-3/8" (111.0) 1-5/8" (41.5) SAE-8 PCM-854 1.5 to 15 (5.7 to 57) 200 (13.8 bar)

 
If you are located in Missouri, Kansas, Nebraska, or Illinois, you may contact us at the following telephone and fax numbers with your requests or questions:
St. Louis telephone 314.428.4000 fax 314.428.4097
Kansas City telephone 913.829.5900 fax 913.829.0815
 
For ALL OTHER AREAS Please use the Info Request form for specific product information, pricing or other information. Please include company name, contact name, address, phone number and fax number to ensure a timely response.
 
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Copyright © 2003 Flo-Products Company
Last modified:
Brochure: 1482-13