Closing a two-way service valve by rotating the stem fully clockwise until it reaches the valve’s back seat effectively isolates the system from the service line pressure. This action allows for maintenance or replacement of components connected to the service line without interrupting the main system operation. For example, a technician might use this procedure to replace a pressure gauge or safety relief valve.
This isolation capability is critical for maintaining system uptime and ensuring worker safety. Preventing the release of pressurized fluids or gases during maintenance significantly reduces hazards. Historically, the ability to isolate sections of complex systems without complete shutdowns marked a major advancement in fluid and gas handling, paving the way for more efficient and safer industrial processes.
