Secondary Valve Actuator (Sva) And Hose; Supervisory Pressure Switch (Optional) - CaptiveAire EWC Installation, Operation And Maintenance Manual

Secondary Valve Actuator (SVA) and Hose

A Secondary Valve Actuator (SVA) (p/n 87-120042-001) is installed on each secondary cylinder assembly
to pneumatically open the cylinder valve(s). The SVA has 1/8" NPT inlet and outlet ports for connection to
the system actuation line via the SVA hose. All secondary hoses require a 1" minimum bend radius. The
SVA includes a spring-loaded locking pin that locks the actuator piston in the discharge position, ensuring
complete discharge of the cylinder contents.
1. Actuation Line Plug
2. Locking Pin
3. Piston

Supervisory Pressure Switch (Optional)

The optional primary and secondary supervisory pressure switch (p/n 87-300040-001) are pre-set to alarm
at a cylinder pressure of ~10% below the lowest operating system pressure of 185 psig (pressure at the
lowest listed operation temperature of 32°F). The supervisory pressure switch uses a diaphragm sensor to
detect pressure changes. At the pre-determined set point, the unit actuates a SPDT snap-acting switch,
converting a pressure signal into an electrical signal. The supervisory pressure switch can be used on
primary and/or secondary cylinders. For primary cylinders, the pressure switch is mounted on the primary
actuator kit. For secondary cylinders, the pressure switch is mounted on the Schrader fitting installed on
the cylinder valve.
1. Supervisory Pressure Switch
(Primary)
2. Wrench Flats
3. Secondary Supervisory
Pressure Switch
4. Schrader Valve Port
Figure 7 - Secondary Valve Actuator
Figure 8 - Supervisory Pressure Switch (Optional)
1
4
3
4. Secondary Valve Actuator Hose
• 7.5" hose option (p/n 87-120045-001)
• 24" hose option (p/n 87-120045-002)
• 60" hose option (p/n 87-120045-003)
2
9
1
2
4
2
3