FISHER™ DIGITAL ISOLATION™
Key Specifications & Parameters
Parameter Specification / Description
Model / Type A configured solution based on standard Fisher control valves (e.g., easy-e™, GX,
| Primary Function | Ultra-Tight Shut-Off (Isolation) for on/off or start/stop service. Note: It is not designed for throttling or continuous control. |
| Sizes | Typically 1/2 inch to 6 inches (DN 15 to DN 150), depending on the base valve selected. |
| End Connections | Flanged (ANSI 150, 300), NPT, etc., as per the base valve. |
| Pressure Ratings | Dependent on the base valve body rating (e.g., ANSI Class 150, 300, 600). |
| Temperature Range | Dependent on the base valve and seat material. Standard PTFE seats are typically suitable for -20° to 400°F (-29° to 204°C). |
| Body Materials | Carbon Steel (WCB), Stainless Steel (304, 316), etc., as per the base valve. |
| Trim & Seating | Soft Seat: PTFE (Teflon) is standard for achieving ANSI Class VI (bubble-tight) shut-off.
Metal Seats: Available for higher temperature services where PTFE is not suitable, though with a higher leakage rate (ANSI Class IV). |
| Leakage Class | ANSI Class VI (Standard with PTFE soft seat) |
| Actuator | Spring-Return (Fail-Safe) Piston Actuator is standard. This provides the high thrust required for tight shut-off and ensures the valve moves to a safe position (open or closed) upon loss of air supply. |
| Digital Controller | FIELDVUE™ DVC Series (e.g., DVC6000, DVC6200) is typically mounted. This provides:
- Valve Positioning (for open/close commands).
- Diagnostics (monitors valve health and performance).
- Partial Stroke Testing (PST): Allows the user to test the valve's response and health without a full process shutdown. |
| Accessories | Solenoid valves, limit switches, supply pressure regulators, and other components to complete the automated on/off package. |
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