Tubular diaphragm valve, 800 series, Fire products – Cla-Val 850-20 User Manual

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Tubular Diaphragm Valve

• 3-Year Warranty
• Low Head Loss
• Cast Steel Construction
• Fusion Coated Epoxy Inside and Out
• Anti-Cavitation Design
• Nickel Aluminum Bronze Construction Option (Alloy C95800)
• Duplex Stainless Steel Construction Option (Alloy 2205)
• Low Maintenance
• Simple and Reliable Operation

The Cla-Val Model 100-43 Tubular Diaphragm Valve is a pressure-
operated, in-line axial valve. A tube diaphragm actuates the valve,
which is comprised of three major components: 1) Tube 2) Barrier and
3) Body. There is only one moving part in the valve — the tube
diaphragm. There are no shafts, packing, stem guides or springs.
The tube diaphragm is a one piece, homogeneous nitrile rubber part
which is extremely durable. The ends of the tube are thick solid rubber,
designed to fit between mating flanges. This design eliminates the pos-
sibility of cutting the tube diaphragm due to overtightening or piping mis-
alignment during installation.
The tube forms a drip tight seal around the barrier when the pressure
is equalized between the valve inlet and the control chamber. When
pressure is removed from the control chamber, the valve is open. The
minimum recommended operating pressure is 40 P.S.I. of inlet pressure.

Modulating Action

The valve tube diaphragm holds any inter-
mediate position when a quantity of water
is exhausted from the control chamber via
the pilot. The quantity of water in the con-
trol chamber is established by the “set
pressure” of the pilot.
The control chamber is filled
or exhausted to atmosphere,
maintaining “set pressure.”

Principle of Operation

Full Open Operation

The valve opens when pilot set

pressure is reached and pressure
in the control chamber is relieved.

Tight Closing Operation

Water pressure (equal to inlet pres-
sure) from valve inlet or from
upstream of valve is applied to the
control chamber. Valve closes bub-
ble tight.

APPROVED

100-43

Inlet

Outlet

Inlet

Outlet

Inlet

Outlet

MODEL

800 Series

Fire Products