Fisher isolation and shutoff valves are critical equipment that ensure complete and safe interruption of flow in process lines.
Core Functions
Safe flow interruption (shutoff)
Automatic closure in emergency scenarios (fail-safe)
High sealing performance
Integration with automation systems
Advantages
Process safety
Reduction of environmental risks
Energy efficiency
Long‑life field performance
Isolation valves and control valves serve different purposes:
Isolation valve (shutoff valve): On / off operation
Control valve: Modulation of flow (stepwise control)
👉 In case of wrong selection:
Sealing problems
Equipment damage
Process inefficiency may occur.
🔹 Ball Valves
Fast open / close
Low pressure drop
High sealing
🔹 Butterfly Valves
Compact design
Large diameter applications
Cost advantage
🔹 Gate Valves
Full bore
Minimum flow resistance
🔹 Plug Valves
High sealing
Tough process conditions
🏷️ Example OEM Models
Fisher A11 Series Ball Valve
Fisher A31A Series Butterfly Valve
Fisher A41 Series Plug Valve
Engineering parameters are critical for correct valve selection.
🔹 Cv / Kv Coefficient
Determines flow capacity
Wrong selection → pressure drop and performance loss
🔹 Leakage Class
Determined according to API 598 / ANSI standards
Metal seat vs soft seat selection is critical
🔹 Seat Type
Soft seat: High sealing
Metal seat: High temperature and wear resistance
🔹 Torque Requirement
Directly affects actuator selection
Critical for large diameter valves
Isolation valves typically operate together with actuators:
Actuator Types
Pneumatic actuator
Electric actuator
Hydraulic actuator
Fail‑Safe Operation
Fail Open: Valve remains open when power is lost
Fail Close: Valve closes when power is lost
Double Acting: Bidirectional control with air
In critical plants isolation valves:
👉 Are used as ESD Emergency Shutdown Valves
In case of fire / pressure rise / leak
Automatic closure
Ensure system safety
| Parameter | Range / Value | Impact |
|---|---|---|
| Pressure Class | PN10 – PN250 | Application compatibility |
| Size Range | DN25 – DN1200 | Process capacity |
| Temperature Range | -50°C – +400°C | Operating conditions |
| Material | Steel / Stainless / Alloy | Durability |
| Sealing | Metal / Elastomer | Safety |
| Certification | CE / ATEX / API | Global compliance |
Correct valve selection → low pressure drop
Appropriate actuator → optimized energy consumption
Sealing → prevents leakage losses
| Failure | Result | Risk |
|---|---|---|
| Wrong valve selection | Loss of process safety | Critical |
| Sealing loss | Leakage and environmental risk | High |
| Actuator mismatch | Loss of control | High |
| Material incompatibility | Corrosion and failure | High |
| Non‑certified product | Safety risk | Critical |
Power plants
Petrochemical facilities
Gas transmission lines
Water treatment systems
Food and beverage production
Industrial automation lines
Yeşil Grup Enerji independently supplies Fisher isolation and shutoff valves to global markets.
Turkey & Middle East Turkey, Saudi Arabia, UAE, Qatar, Kuwait, Iraq, Jordan, Oman
Europe Germany, France, Italy, Netherlands, Belgium, Spain, Poland, Romania, Czechia, Hungary, UK
Central Asia & CIS Azerbaijan, Kazakhstan, Uzbekistan, Turkmenistan, Georgia, Ukraine
Africa Algeria, Egypt, Nigeria, South Africa, Angola, Kenya, Morocco
Asia China, India, South Korea, Indonesia, Malaysia, Vietnam, Thailand
Americas USA, Canada, Brazil, Mexico, Chile
OEM code
Pressure class
Size range
Temperature range
Actuator type
Sealing requirement
Certification needs
Why are Fisher isolation valves preferred? They provide high sealing, safety and long‑life performance.
What is fail‑safe? A mechanism that moves the system to a safe position when power is lost.
What is an ESD valve? A safety valve that automatically shuts the system in emergencies.
How to choose the right valve? By engineering analysis based on pressure, temperature, flow and process conditions.
Fisher isolation and shutoff valves: ✔ Provide safe flow interruption ✔ Improve process safety ✔ Reduce energy losses ✔ Are reliably used in global projects
For your project:
OEM code validation
Valve selection and sizing
Actuator selection
Certification consultancy
📞 +90 505 696 61 00
🌐 www.yesilgrupenerji.com
Yeşil Grup Enerji is an independent industrial supplier. Without official distributorship, our global sourcing network enables fast and reliable solutions.