Series 42/742 Diaphragm Seal0 pages

Series 42/742 Diaphragm Seal
Ǡ Series 742 can be flushed or rodded clean
without removal from line or disassembly

Red Valve's Series 42 Pressure Sensor and Series 742 Diaphragm Seal isolate and provide accurate instrument reading
of gauges, transmitters, and pressure switches, making them
ideal for use in chemical or slurry service. The Series 42 and
Series 742 can be mounted in any flow direction, and have
threaded ends manufactured to standard NPT pipetap
dimensions for smaller pipelines. The principle of operation
is simple. As process pressure is sensed by the 360° elastomer
sleeve, the captive fluid transfers the process pressure to the
instrument, providing a consistent, accurate reading.

Ǡ Protects and isolates instrumentation from
chemical or slurry plugging
Ǡ Lower installation and operating costs

The Series 742 offers a significant advantage over traditional
diaphragm seals. When installed perpendicular to the pipeline,
the Series 742 can be isolated so that in the event of plugging, the elastomer slurry ring area, which isolates the instrument, can be flushed (Figure 1) or rodded clean (Figure 2).

Materials of Construction
Ǡ Body (Non-Wetted) and Upper and Lower Case
(Wetted) - Carbon Steel, 316 Stainless Steel, or PVC

The Only Diaphragm Seal That Can Be
Flushed Without Removal From The Line

Ǡ Sleeves Available in Pure Gum Rubber, Neoprene,
Hypalon®, Chlorobutyl, Buna-N, Viton®, EPDM,
Food Grade Elastomers, Teflon ® coated Buna-N,
or Teflon® coated Viton®

Figure 1

Ǡ Fill Fluid; Ethylene Glycol & Water (200° F),
Vegetable Oil (230° F), Silicone Oil (400° F)

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Series 42 Pressure Sensors and Series 742 Diaphragm Seals
are available in sizes 1/2" through 2". The Series 42 features
a top-mounted gauge, while the Series 742 is supplied with
a standard back mounted gauge. A complete Series 742
Diaphragm Seal, including optional isolation ball valve, is
available for immediate delivery.

DIAPHRAGM
SEAL

Series 42

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F to F

ISOLATION VALVE –
OPTIONAL

RED VALVE
SERIES 742
DIAPHRAGM
SEALS

Series 742

D

Figure 2

ISOLATION VALVES –
OPTIONAL

F to F

CLOGGED AND
INOPERABLE

ACCURATE MEASUREMENT

D

DIMENSIONS SERIES 42/742
Size
D
1 /2 "
1"
11 /2 "
2"

Length
F to F
2 7 /8 "
3 3 /8 "
3 3 /8 "
3 3 /8 "

Working*
Pressure
(psi)
720
720
720
720

* PVC Unit has Working Pressure of 200 psi; Higher Working Pressure Available.

Weight
(lbs)
5
6
15
20