Transcript Air Release Valve • Series ARV - Plast-O

Flow Control Valves
Series FC
Purpose of a Flow Control Valve…
Imagine having
an employee who
would throttle a
valve to maintain
a constant rate of
flow, regardless
of changing
pressure.
But a Flow Control Valve Won't Get
Tired…
…and it doesn’t take a lunch break.
It works automatically and is completely tamper-proof!
Uses for a Series FC
Flow Control Valve
1. To maintain a constant rate of flow in a
range of ¼ GPM to 120 GPM (.95 LPM to
454 LPM) with ±10% accuracy.
2. Replace costly, exotic flow control valves.
3. Eliminate guesswork and labor-intensive
manual flow controls such as throttling
ball valves.
4. Prevent tampering of flow rate.
How it Works:
Inlet side
Outlet side
Ribs
A unique rubber diaphragm in the valve allows liquid
to flow between a series of ribs…
The cone-shaped outlet side of the diaphragm is set against a
unique, precision machined orifice plate. As pressure
increases, the diaphragm is pressed deeper into the orifice
plate, preventing an increase in flow.
By using different sized diaphragms
and custom cut orifice plates, a flow
control valve can be built to the exact
GPM required.
For larger pipe sizes and higher flow rates,
multiple diaphragms and orifice plates are
used.
Let’s See this Valve in Action…
Here’s the FC after being installed in a piping system.
No liquid is present, and the diaphragm is under no
pressure.
INLET
OUTLET
Turn the pump on, and liquid is flowing through the
system in the desired direction. Since flow has just
started, it is below the flow rate of the valve, and the
diaphragm is not yet pressurized.
INLET
OUTLET
It is important to understand that the FC cannot “increase” a low
flow rate. It’s not a pump!
As pressure increases, the diaphragm and orifice
combination assure that flow does not exceed the
specified flow rate.
INLET
OUTLET
Keep in mind that the flow rate is specified when the valve is
ordered.
Increased pressure and flow force the diaphragm further
into the orifice, which restricts flow and assures that it
stays at the desired rate downstream.
INLET
OUTLET
A minimum 15 PSI pressure drop across the valve is required for
flow to remain at the pre-set rate.
Now the pressure is extremely high, and the diaphragm is
pressed hard against the orifice, yet the flow rate
downstream has very little variation.
INLET
OUTLET
Flow rate will vary ±10% with buna diaphragms, ±15% with
EPDM diaphragms.
Installing the Series FC Valve...
• Because of the way the
diaphragm works, it is
important that the valve be
installed in the proper
direction.
Installation, continued…
• As long as you’ve got the
FC pointed in the proper flow
direction, it can be oriented in
any position in the piping
system…up, down, sideways,
even on an angle!
Once a 15 PSI (1bar) differential is established, the valve
works automatically as pressure rises and falls. It’s
completely maintenance-free…install it, and forget it!
While inlet
pressure
changes…
Downstream flow
rate remains
constant!
But wait…there’s more!
Plast-O-Matic Series Flow Control Valves offer…
Purity & Corrosion Resistance — No metal parts to corrode or
release impurities.
Convenience — Threaded connections standard; also available with
sockets, spigots, flare, flange, and custom connections.
Great Selection — Series FC is offered in a variety of corrosionresistant thermoplastics: Geon® PVC, Kynar® PVDF, Natural
Polypropylene, and PTFE.
Key Sizes — ¼” through 3” pipe sizes.
And to review the key points…
• Install it & Forget it: Tamper-proof valve
maintains a constant, predetermined flow rate.
• Automatic Operation: A diaphragm changes
shape with inlet pressure changes, thus maintaining
a constant flow rate.
• Economical: Replace costly flow control valves,
or unreliable manual throttling valves.
• Specify the Flow Rate: From ¼ to 120 GPM
• Minimum Pressure Drop: 15 PSI to achieve
desired flow.
Series FC Flow Control Valves
…an economical alternative to costly, exotic flow controls!