Modular shut-off valve apparatus

A valve apparatus for use in a piping system having a first pipe and a second pipe through which material flows, the valve apparatus comprising

• a main valve module having a valve body coupled to the first and second pipes, the valve module having a valve member movable relative to the valve body between a first position blocking material flow through the valve body and a second position permitting material flow through the valve body,
• a pneumatics module coupled to the main valve module and having a pneumatic actuator that receives pressurized air from a pressurized air source to move the valve member from the first position to the second position, the pneumatics module having an electrical actuator that operates to selectively block and unblock delivery of pressurized air to the pneumatic actuator, the pneumatics module being decouplable from the main valve module while the valve body remains coupled to the first and second pipes, and
• an electronics module coupled to the pneumatics module, the electronics module having an electrical connector and at least one conductor that electrically couples the connector to the electrical actuator, the electronics module being decouplable from the pneumatics module while the main valve module remains coupled to the pipes of the piping system, while the pneumatics module remains coupled to the main valve module, and while the source of pressurized air remains coupled to the pneumatics module.