Masoneilan 78-80S & 08-80S Transfer Valves Instruction Manual
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© 2021 Baker Hughes Company. All rights reserved.
1. Overview
The
Model 78-80S
is a transfer valve combining a pilot valve of the floating ball type and three-port
valve into one unit and is a standard-capacity three-way transfer valve of a set pressure regulating type.
The other
model 08-80S
, is the same as the 78-80S except that a pilot valve is not combined and is
the so-called three-way transfer valve. If several 78-80S are needed, one 78-80S can be installed,
connecting 08-80Ss to it by mating the pilot outlet pressure (“SIG.OUT”) on the 78-80S to “SIG” on the
08-80S to simplify piping and achieve transfer.
The structures of these models are shown on pages 8 and 9.
2.
Specifications
•
Maximum operating pressure
Body
1.72 Mpa
Signal part 1.03 Mpa
•
Set pressure range: 100kPa to 700kPa
•
Hysteresis: 34kPa or less
•
CV value
IN→ OUT 0.8
OUT→EXH 1.3
•
Connection
IN, OUT, EXH and SIGNAL connection ports:
Rc 1/4 (Option NPT 1/4)
•
Operating temperature range: -30°C to +83°C (option: 0°C to +100°C)
3.
Certifications
This instrument is certified in:
•
Azerbaijan (AzSERTCENTER)
•
Russian Federation (CU-TR Ex)
•
Armenia
•
Uzbekistan (UZSTANDART)
•
Belarus
•
China (China Ex)
•
Kazakhstan
•
and is also
ATEX compliant
.
4. Mounting
Clean all the pipes before mounting the valve and completely remove dust, scale and other foreign
matter. Mount the transfer valve as close to the actuator as possible and let air flow toward the IN and
OUT marks located on the lower side of the body. When using the valve as a lock-up valve, put a blind
plug in the EXH port.
Two air connection ports to the pilot part are provided on the 78-80S, one being marked SIG and the other,
SIG OUT. Connect the signal pressure to the port marked SIG. Use SIG.OUT for sending signal to the 08-
80S when it is also mounted.
The transfer valve functions to cut off IN and to connect OUT to EXH when the signal pressure lowers
below the set pressure or is reduced to zero.
Do not use signal pressure at air pressure exceeding 1.03Mpa (10.5kgf/cm2).
Feeding signal pressure from near the IN side of the body will cause fluctuations in signal and air
pressures. This may cause hunting.
