Asco Valve Store

Adjustable Flow Control Valves

The solenoid is an electromagnetic part of a valve, comprised of a coil, coretube, core and enclosure. ASCO Redhat brand offers the worlds largest selection of 2-, 3- and 4-way solenoid valves, designed to handle the most demanding fluid control applications.
Asco Steam Valves
General Description
  Important Optional Enclosures
Operation Nominal Ambient Temperature Valve Parts in Contact with Fluids
ASCO's patented adjustable flow control design has greater flow capacity than most conventional constructions where a separate adjustment speed control and ball check for free flow are utilized.

A spring loaded disc allows free flow in one direction and an adjustable or controlled flow in the opposite direction. Flow adjustment is performed by a tapered brass stem that controls the flow through the cross hole in the disc.
Valves may be mounted in any position.
The adjustable knob contains a unique locking device that consists of a plastic metering knob and thumb latch pawl. The valve bonnet is scribed with graduations to serve as a position indicator for the stem
When the pawl is in the up position, it creates a friction lock on the knurled bonnet and the knob cannot rotate. When the pawl is at 90° to the knob, the knob is free to rotate. 125°F Maximum. Body and Stem -- Brass
Seals -- Buna "N" Disc -- Acetal Spring -- 302 s.s. Retainer -- 17-7PH s.s.
Catalog Number Pipe Size (ins.) Orifice Size (ins.) CV Flow Factor ¹ Operating Pressure
Maximum Operating Pressure Differential
Max. Fluid Temp.
Meter Free Air-Inert Gas, Water and Light Oil
V022A1 ¼ ³/8 .22 1.2 1 300 180
V0222 ³/8 ³/8 .90 1.4 1 300 180
V0223 ½ 7/16 1.2 2.6 1 300 180
V0224 ¾ 17/32 1.6 4.0 2.5 300 180
NOTE: 1 -- Refer to Chart A for Cv vs. Metering Stem Turns.
Chart A Flow Characteristics for ASCO Flow Control Valves

Metering Stem Turns
Free Flow Data
Pipe Size Cv
¼ 1.2
³/8 1.4
½ 2.6
¾ 4.0
Example I: A ½" N.P.T. flow control valve is required to pass 3 GPM of water at a p of 16 psi. Determine the position of the metering stem.
Cv = GPM

  Cv = GPM


From the graph for the ½" N.P.T. flow control valve with a Cv of .75 the stem should be positioned three turns out from fully closed.

Example II: To determine the flow using the same data of 16 psi, and METERED Cv fo .75, the solution will be:
GPM = Cv = .75 = 3

Example III: The flow through this valve in the FREE FLOW position is: GPM = Cv* = 2.6 = 10.4
*Cv is obtained from the free flow data table.

P1 -- Inlet Pressure (PSIA)
P2 -- Outlet Pressue (PSIA)
p -- Pressure Drop (P1 - P2) psi
G -- Specific Gravit of Gas @ 14.7 PSIA and 60°F
T -- Absolute Temperature of Flowing Medium (°F + 460)

Sizing Equations
Water Air
Cv = GPM

  Cv = SCFH

GPM = Cv SCFH = Cv 960