Ross Asia SV27 series single valve Safety cat. 2 PL c, externally monitored LOX with and without manual lockout

Made in Japan
Manufacturer : Ross Asia
Model : SV27 series single valve

SV27 Sensing Valves with Manual Lockout L-O-X ® Control Product Overview

Lockout/Tagout Air Dump/Release Function

The SV27 Series Sensing Valve uses a safety-rated DPST (Double-Pole Single-Throw) switch to monitor the valve’s operating position. The SV27 3/2 valve can be used for safe shut-off and exhaust functions for Category 2 applications with proper integration and monitoring. The feedback switch informs the controls that the valve internals have shifted properly.

Sensing Valves SV27 Series, based upon the proven 27 Series valve family, combine the tough, dirt tolerant characteristics of poppet technology with sensing for internal position and state.

Electrical feedback is provided via a positively-driven, safety-rated DPST (Double-Pole Single-Throw) switch with both normally open (NO) and normally closed (NC) contacts. The DPST switch is actuated whenever the valve is not in the normal home position.

Additional verification can be achieved by installing an optional visual pressure indicator or pressure switch into the 1/8 NPT pressure verification port (PV) for verification of pressure release.

VALVE FEATURES

Specifications

PRODUCT CREDENTIALS

Ordering Information

Solenoid Pilot Controlled Valves

MODEL NUMBER CONFIGURATOR(3-Way 2-Position Valves)

Pressure Controlled Valves

MODEL NUMBER CONFIGURATOR(3-Way 2-Position Valves)

Valve Operation

Solenoid Pilot Controlled Valves
Pilot De-energized	With the solenoid pilot de-energized (regardless of the position of the L-O-X ® handle) the inlet poppet remains closed. The outlet port is connected to the exhaust port so that pressure in the downstream lines is vented to atmosphere.The switch is in a de-actuated position.
Pilot Energized	With the solenoid pilot energized and the L-O-X ® control in the open position, air can flow from inlet to outlet port. The exhaust port is closed. The inlet poppet stem will cause the switch to be actuated indicating that the valve is open.
L-O-X® Valve Closed	With the handle pushed inward, the L-O-X ® control is closed, and air to the valve piston is cut off. This allows the inlet poppet to be closed by its spring and the pressure of the inlet air. The outlet is connected to exhaust so downstream pressure is vented. The switch is in a de-actuated position.

Pressure Controlled Valves
Valve Closed	With a short push of the red handle inward the flow of supply air is blocked and downstream air is exhausted via the exhaust port. Air pressure on the inlet and exhaust poppets produces a large closing force. The L-O-X ® valve should be padlocked in this position to prevent the handle from being pulled outward inadvertently when potential for human injury exists or servicing machinery.The switch is in a de-actuated position.

Valve Open	With the red handle pulled out, pilot air flows to the top of the actuating piston, causing it to open the inlet poppet. Supply air then flows freely from inlet to outlet, and the exhaust port is blocked. A detent keeps t h e L- O -X ® handle in the open position. The handle is designed not to be locked in the open position, thereby allowing for quick shut-off when necessary. The inlet poppet stem will cause the switch to be actuated indicating that the valve is open.