1. Asahi/America Constant Flow Valves

2. Asahi/America Constant Flow Valves
PVC & CPVC ANSI Flanged
In Line Type
Y Type
1/2”,3/4”
1”,2”,3”,4”
Spring
Plug
Orifice
Spring
Plug
Orifice

3. Asahi/America Constant Flow Valves
Features & Benefits
High durability and resistance to chemicals
High accuracy
Flexible flow rate
Opening degree indicator
High durability and resistance to chemicals
The spring is made of stainless steel with coating of PCTFE.
ETFE acts as an excellent gas barrier to chemicals such as Cl2,HF,HNO3,HCL and so on.
The superior durability has been proven by conducting a repeated spring fatigue test .(1 Million cycles)

4. Asahi/America Constant Flow Valves
Flexible flow rates
Opening degree indicator
Calibrated Flow Dial

5. PVC (Unplasticized Polyvinyl Chloride)
Asahi/America Constant Flow Valves
Nominal Size
1/2”, 3/4”, 1”, 2”, 3” ,4”
Body material
PVC (Unplasticized Polyvinyl Chloride)
Flange connection
ANSI, DIN etc.
(Please specify according to upstream pressure)
Upstream line Pressure
ranges.
Types Under psi
psi
psi
psi
psi : Type A & B
psi : Type D (only 3”)
psi : Type C
Pressure differential
range for function:
Working Temp. : °F

6. Asahi/America Constant Flow Valves
Rangeability

7. Asahi/America Constant Flow Valves
Type - A
Fluid flows through the valves internals
Suitable for semi-conductor.(Ultra pure water line)
Flow
Type - B
Flow rate setting range is large.
(Covers small flow rates to large flow rates)

8. Asahi/America Constant Flow Valves
Type - C
Range of working differential pressure is large .
(For lines with large pressure differential between upstream & downstream)
Flow
Type - D
A large flow rate can be set.

9. Asahi/America Constant Flow ValvesP1 P2 P2

10. Asahi/America Constant Flow Valves
High accuracy
Flow Quantity
It is possible to change the flow quantity by changing the position of the plug.
Pressure Differential

11. Asahi/America Constant Flow Valves
B type (2”)
C type (2”)
39.6
39.6
35.2
35.2
30.8
30.8
26.4
Flow (gal/min)
26.4
Flow (gal/min)
22.0
22.0
17.6
17.6
13.2
13.2
8.8
8.8
4.4
4.4
2.85
5.7
8.6 11
14.22
2.85
5.7
8.6
11.4
14.3
17.1 20
22.9
25.7
28.6
31.4
34.3
37.1
Differential Pressure (psi)
Differential Pressure (psi)
2.85 psi psi
4.27 psi psi

12. Asahi/America Constant Flow Valves
Q1+Q2 Q1 Q2
LINE A
LINE B
Parallel Lines
CV = Q Ö[s.g. / DP]
(Q = flowrate (gpm)
s.g. = specific gravity)

13. Asahi/America Constant Flow Valves
< Fish Farms >
<Aquariums>
sea
water
tank
AV Constant Flow VALVE

14. Asahi/America Constant Flow Valves
Applications:
< Salt Water >
The protection of
ion-exchange
membranes.
Flow quantity is fixed.
No Automation or
Manual Adjustment
Required

15. Asahi/America Constant Flow Valves
Water Supply or Filtration
AV Constant Flow VALVE
Water
supply
equipment