9
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.
Figure 8 - Secondary Valve Actuator
Supervisory Pressure Switch
The primary and (optional) secondary supervisory pressure switch (p/n 87-300040-001) are preset to
alarm at a cylinder pressure of ~10% below the lowest operating system pressure of 175 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 predetermined 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. Apply Leak Lock joint sealing compound on the sealing surface of the
Schrader valve when connecting/replacing the supervisory pressure switch.
Figure 9 - Supervisory Pressure Switch
1. Vent Limiting Orifice
2. Locking Pin
3. Piston
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)
1. Supervisory Pressure Switch
(Primary)
2. Wrench Flats
3. Secondary Supervisory
Pressure Switch (Optional)
4. Schrader Valve
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