Gascat ARGOS - Security Shut-Off Valve; Ph Actuator & H Actuator; General Reset Procedure

Installation and Operation Manual
Argos - Pressure Regulating Valve
MI-23
Elaborado Verificado / Aprovado CSQ Data Revisão Página
JJ VBL JM 13/02/19 07 13 de 32
3.5 SECURITY SHUT-OFF VALVE
3.5.1 PH ACTUATOR & H ACTUATOR
The slam shut valve has two actuators models, one with a diaphragm (for pressures 1.0 – 11.0 bar) and other with a
piston (for pressures 10.0 – 60.0 bar).
Mechanism consists in a shaft (stem) and spheres collar monitoring the outlet pressure. In case of outlet pressure
increase or decrease, the external bush will move up or move down, allowing the spheres running out of channel and the
main shaft moves according to the force exerted by closing spring to close the valve against the seat, shutting downs the
gas totally tight (see the picture with the two conditions).
After reestablishing to the normal service condition operation it is necessary to reset manually the slam shut valve.
- Position 1: Shutting by increase pressure
- Position 2: Balanced mechanism
- Position 3: Shutting by decrease pressure
3.5.2 – GENERAL RESET PROCEDURE
To reset the valve to the open position (ready to work), the sensing line should be connected in the actuator
chamber .
Position 1
Position 2
Position 3