Series S
Series S :
Pneumatically Actuated 3/2 & 5/2 Spool Valves (Pilot Operated)
Mercury’s pneumatically actuated (pilot-operated) 3/2 and 5/2 spool valves are engineered for precise and reliable air flow control in industrial automation. These valves use a pneumatic signal to shift the main spool, making them ideal for remote operation or when electrical actuation isn’t suitable.
Why Use Pilot-Operated Valves?
Pilot-operated valves are essential when:
Higher flow control is needed without manual or electric actuation
Electrical actuation is restricted (e.g., explosive or wet environments)
Centralized pneumatic logic or sequential control is used
With robust construction, low actuation pressure, and precision-machined internals, Mercury’s pilot-operated valves ensure consistent performance, long life, and smooth operation—even in demanding environments.
| Model No. | Description | Size (BSP) | Seal Kit No. |
|---|---|---|---|
| S381 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – SPRING VALVE | 1/8″ | SKS381 |
| S382 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – SPRING VALVE | 1/4″ | SKS382 |
| S384 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – SPRING VALVE | 1/2″ | SKS384 |
| S391 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – PILOT VALVE | 1/8″ | SKS391 |
| S392 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – PILOT VALVE | 1/4″ | SKS392 |
| S394 | 3/2 (3 WAY) NORMALLY CLOSED PILOT – PILOT VALVE | 1/2″ | SKS394 |
| Model No. | Description | Size (BSP) | Seal Kit No. |
|---|---|---|---|
| S681 | 5/2 (5 WAY) PILOT – SPRING VALVE | 1/8″ | SKS681 |
| S682 | 5/2 (5 WAY) PILOT – SPRING VALVE | 1/4″ | SKS682 |
| S684 | 5/2 (5 WAY) PILOT – SPRING VALVE | 1/2″ | SKS684 |
*Add Voltage & Connector Suffix While Ordering
| Model No. | Description | Size (BSP) | Seal Kit No. |
|---|---|---|---|
| S691 | 5/2 PILOT – PILOT VALVE WITH MANUAL OVERRIDE | 1/8″ | SKS691 |
| S692 | 5/2 PILOT – PILOT VALVE WITH MANUAL OVERRIDE | 1/4″ | SKS692 |
| S791 | 5/3 PILOT – PILOT VALVE PHN WITH MANUAL OVERRIDE | 1/8″ | SKS791 |
| S792 | 5/3 PILOT – PILOT VALVE PHN WITH MANUAL OVERRIDE | 1/4″ | SKS792 |
| S894 | 5/3 PILOT – PILOT VALVE PAN WITH MANUAL OVERRIDE | 1/2″ | SKS894 |
| S992 | 5/3 PILOT – PILOT VALVE PRN WITH MANUAL OVERRIDE | 1/4″ | SKS992 |
| S994 | 5/3 PILOT – PILOT VALVE PRN WITH MANUAL OVERRIDE | 1/2″ | SKS994 |