The type R88 is a pressure sensing pneumatic pilot giving an output air signal which can be used to position an ESME control valve and so control line pressure upstream or downstream of the control valve.
A range of pressure sensing heads in carbon steel or St/Steel are available for ranges 0.2 – 103.0 bars and for differential pressure ranges 0.2 – 20.7 bars. Above 41.4 bars St/steel bellows sensing units are used.
Diaphragm material is St/steel and construction includes protection for the 3-way valve and stem in the event of the sensing head being heavily over-pressured.
The type R88 pilot can be used with the ESME type R188 fail-fix locking valve to hold the position of the associated control valve in the event of supply air failure.
The air signal from the type R88 should be piped direct to the control valve actuator, a control valve positioner is unnecessary and should not be used.
Gas can be used for operation provided it is compatible with the materials of construction of the 3-way valve. The bleed from the exhaust port may be piped way to a safe area. In certain applications low viscosity liquid can be used for operation. Refer to factory for information and approval before using a liquid supply.
Specifications
The type R88 is a pressure sensing pneumatic pilot giving an
output air signal which can be used to position an ESME control
valve and so control line pressure upstream or downstream of the
control valve.
A range of pressure sensing heads in carbon steel or St/Steel
are available for ranges 0.2 – 103.0 bars and for differential
pressure ranges 0.2 – 20.7 bars. Above 41.4 bars St/steel
bellows sensing units are used.
Diaphragm material is St/steel and construction includes protection
for the 3-way valve and stem in the event of the sensing head
being heavily over-pressured.
The type R88 pilot can be used with the ESME type R188 fail-fix
locking valve to hold the position of the associated control valve
in the event of supply air failure.
The air signal from the type R88 should be piped direct to the
control valve actuator, a control valve positioner is unnecessary
and should not be used.
Gas can be used for operation provided it is compatible with the
materials of construction of the 3-way valve. The bleed from the
exhaust port may be piped away to a safe area.
In certain applications low viscosity liquid can be used for
operation. Refer to factory for information and approval before
using a liquid supply.