In many cases, using a portable valve actuator might be the better option for opening large manual valves.
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Sofis on LinkedIn: Safe and effortless operation of large manual
Power Wrench portable valve actuator
Valve interlock key management systems
SuperCompact control valves and linear actuators - Belimo
Quickly, safely and easily operate manual valves! - Sofis valve
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Valve lockout - Sofis valve operation
Sofis portable actuators
Watts 3/4 In Lead Free Anti-Siphon Pressure Vacuum Breaker
Solutions - Sofis valve operation
Installation, maintenance and engineering support - Sofis valve