A Masoneilan SVI II ESD Emergency Shutdown Device valve is a valve that operates to ensure that the process is brought to its safe state. During normal operation, these ESD valves are typically energized to stay open (ATO). In case of an unsafe situation, the Masoneilan SVI II ESD Emergency Shutdown Device valve is de-energized by the Safety System. The Masoneilan SVI II ESD Emergency Shutdown Device device performs this shutdown function for Safety Instrumented Functions (SIF) that require field devices to be certified for safety-related applications according to IEC61508 is certified by TUV for use up to SIL3 with an HFT of 0 in low demand applications. The built-in microprocessor is used for valve diagnostics only. The microprocessor has no direct role in performing the designated safety function therefore the SVI II ESD is considered a Type A device.
Masoneilan SVI II ESD Emergency Shutdown Device valve has the following features:
When de-energized, the SVI II ESD moves to its fail-safe position. For a single-acting PST controller, the safe state is when the port Actuator 1 is exhausted to a pressure less than 1 PSIG (0.069 bar, 6.9 kPa). The valve actuation must automatically move the valve to the safe state when the digital valve controller falls in a safe state. The SVI II ESD is intended to be part of the final element subsystem, as per IEC 61508, and the achieved SIL level of the function must be verified by the function designer
The designer of a SIF must check that the product is rated for use within the environmental limits as stated in Table 14 on page 163.
The Masoneilan SVI II ESD Emergency Shutdown Device meets SIL 3 requirements as outlined below.
The product has met manufacturer design process requirements of Safety Integrity Level (SIL) 3. These are intended to achieve sufficient integrity against systematic errors of design by the manufacturer. A Safety Instrumented Function (SIF) designed with this product must not be used at a SIL level higher than the statement without prior use justification by end-user or diverse redundant technology in the design.
| Actuator Size Masoneilan |
Stroke | Mounting Hole |
Lever Hole |
Turnbuckle Length |
| 6 and 10 | 0.5 – 0.8″ (12.7 – 20.32 mm) |
A | A | 1.25″ (31.75 mm) |
| 10 | 0.5 – 0.8″ (12.7 – 20.32 mm) |
A | A | 1.25″ (31.75 mm) |
| 10 | >0.8 – 1.5″ (20.32 – 41.5 mm) |
B | B | 1.25″ (31.75 mm) |
| 16 | 0.5 – 0.8″ (12.7 – 20.32 mm) |
B | A | 2.90″ (73.66 mm) |
| 16 | >0.8 – 1.5″ (20.32 – 41.5 mm) |
C | B | 2.90″ (73.66 mm) |
| 16 | >1.5 – 2.5″ (41.5 – 63.5 mm) |
D | C | 2.90″ (73.66 mm) |
| 23 | 0.5 – 0.8″ (12.7 – 20.32 mm) |
B | A | 5.25″ (133.35 mm) |
| 23 | >0.8 – 1.5″ (20.32 – 41.5 mm) |
C | B | 5.25″ (133.35 mm) |
| 23 | >1.5 – 2.5″ (41.5 – 63.5 mm) |
D | C | 5.25″ (133.35 mm) |
Applicable Industries of Masoneilan Type 51/52/53 Pneumatic Piston Actuators
Power Generation, Refining, Petrochemicals, Midstream Oil & Gas, Upstream Oil & Gas.
Key Applications: Steam Turbine Generator, Condenser, Cooling Tower, Reactor Building, Turbine Building, Reactor Facility Grounds & BOP, Steam Turbine, Gas Turbine, Heat Recovery Steam Generator, Balance Of Plant, Distillation, Hydroprocessing Reforming, Cracking, Secondary, Blending, Quenching & Fractioning, Charge Gas Compression, Seperation, Pipeline Integrity, Operations, Dehydration, Refrigeration, Liquifaction, Loading/Shipping, Regasification, Auxillary, Dehydration/Treating, Compression.
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