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OCV Control Valves — Model 120 Rate of Flow Control Valve

Model 120 Rate of Flow Control Valve


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The Model 120 has a wide range of applications: anywhere the flow rate
must be controlled or limited.
Typical examples include:
●Pump systems
●Fuel metering systems


SERIES FEATURES

●Controls or limits flow to a predetermined rate
●Built-in orifice plate for sensing flow rate
●Extra-sensitive differential pilot
●Flow rate is adjustable with single screw
●Adjustable response speed
●Can be maintained without removal from the line

●Factory tested and can be pre-set to your requirements

OPERATION
The normally open, spring loaded pilot, sensing
the differential across the integral orifice
plate which is located in the valve inlet flange,
responds to changes in differential and causes
the main valve to do the same. Increased differential(flow rate) works to close the pilot and
main valve, whereas decreased differential
works to open them. The net result is a constant
modulating action of the pilot and main
valve to hold the differential, hence the flow
rate, constant. The pilot system is equipped
with a needle valve that fine tunes the valve's
response to the system variables.
COMPONENTS
The Model 120 consists of the following components,arranged as shown on the schematic diagram:
1.) Model 65 Basic Control Valve
2.) Orifice Plate
3.) Model 2450 Rate of Flow Control Pilot
4.) Model 126 Ejector
5.) Model 141-2 Needle Valve
6.) Model 123 Inline Strainer
7.) Model 155L Visual Indicator (optional)

SIZING
The following chart states the minimum and
maximum flow rate with standard bore orifice
plate, based on a fluid specific gravity of 0.8.
This means the valve can be adjusted to control
within the ranges shown. Lower flow ranges are
possible through the use of smaller orifice plate
bore and all ranges are adjustable within a 4:1
ratio (high to low flow). Consult the factory for
assistance.

SCHEMATIC


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RECOMMENDED INSTALLATION
Install the valve with adequate space above and around the valve to facilitate servicing.
Refer to the Dimension Table.
Valve should be installed with the bonnet (cover) at the top, particularly 8" and larger
valves, and any valve with a limit switch.
Shut-off valves should be installed upstream and downstream of the control valve.
These are used to isolate the valve during start-up and maintenance.
In order to properly set the flow rate, a meter, or some other means of measuring flow,should be installed in series with the control valve.


MAX. PRESSURE
(The pressures listed here are maximum working
pressures at 100°F)

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SIZES
GLOBE/ANGLE
Flanged Ends - 1 1/4" - 24" (globe);
1 1/4" - 16" (angle)
FLUID OPERATING TEMPERATURE
RANGE (Valve Elastomers)
Buna-N -20°F to 180°F
Viton 20°F to 230°F
Fluorosilicone -40°F to 150°F
EPDM 0°F to 230°F
MATERIALS
Consult factory for others.
Body/Bonnet: Ductile Iron (epoxy
coated), Carbon Steel (epoxy coated),
Stainless Steel, Aluminum
Seat Ring: Stainless Steel,
Bronze
Stem: Stainless Steel, Monel
Spring: Stainless Steel
Diaphragm: Buna-N, Viton, (Nylon
reinforced)
Seat Disc: Buna-N, Viton
Pilot: Stainless Steel, Bronze
Other pilot system
components: Stainless Steel,
Bronze/Brass
Tubing & Fittings:
Stainless Steel, Copper/Brass
SPECIFICATIONS (Typical Aviation Fueling Application)
The rate of flow control valve shall function to control or limit the flow rate, regardless of fluctuations in
upstream or downstream pressure.
DESIGN
The rate of flow control valve shall be a single-seated, line pressure operated, diaphragm actuated, pilot
controlled globe valve. The valve shall seal by means of a corrosion-resistant seat and a resilient, rectangular
seat disc. These, and other parts, shall be replaceable without removing the valve from the line.
The stem of the main valve shall be guided top and bottom by integral bushings. Alignment of the body,
bonnet and diaphragm assembly shall be by precision dowel pins. The diaphragm shall not be used as
a seating surface, nor shall the pistons be used as an operating means. The orifice plate shall be integrally-
installed in the valve inlet flange. The pilot system shall be furnished complete, installed on the
main valve and include a needle valve speed control and an inline strainer. The rate of flow control valve
shall be operationally and hydrostatically tested prior to shipment.
MATERIALS OF CONSTRUCTION
The main valve body and bonnet shall be ductile iron. All ferrous surfaces shall be coated with 4 mils of
epoxy. The main valve seat ring shall be stainless steel. Elastomers (diaphragms, resilient seats and Orings)
shall be Buna-N. The control pilot shall be stainless steel, while the opening speed control and
control line tubing shall be stainless steel. The orifice plate shall also be stainless steel.
OPERATING CONDITIONS
The rate of flow control valve shall be suitable for controlling the flow rate over a range ofto 4:1)> gpm at pressures ranging frompsi.
ACCEPTABLE PRODUCTS
The rate of flow control valve shall be aModel 120,, with
<150# flanged="">end connections, as manufactured by OCV Control Valves, Tulsa,
Oklahoma, USA.

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**Note: for military fueling valves, 6" 150# flanges have 20" face to face dimensions and 6" 300# flanges have 20-7/8" face to face dimensions.


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