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Van Tuyến Tính Khí Nén: Cấu Tạo, Nguyên Lý, Ứng Dụng Và Cách Chọn
Van tuyến tính khí nén: cấu tạo, nguyên lý hoạt động, tín hiệu 4–20mA, ứng dụng nhà máy, cách chọn Bộ định vị van, actuator, Kvs/Cv và những sai lầm cần tránh.
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Spirax Sarco globe control valves are specifically designed for boilers, steam systems, heat transfer oil, HVAC, textile dyeing, and food processing. They offer precise 4-20mA control, stable operation, and come with complete CO-CQ documentation.
What is a Spirax Sarco Globe Control Valves ?
Spirax Sarco globe control valves is a device used to regulate the flow rate of a fluid based on a 4-20mA or 0-10V control signal. It is commonly used in systems such as:
• Steam systems
• Boiler systems
• Heat exchangers
• Heat transfer oil systems
• HVAC systems
• Textile dyeing systems
• Food processing plants
• Chemical plants
Unlike ON/OFF valves, linear valves allow opening in percentage stroke, providing more stable temperature and pressure control.
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Spirax Sarco globe control valves applications in boilers and steam systems
Practical applications in factories
From practical experience implemented in many factories:
Boilers
Used to regulate steam input to:
• calorifers
• heating tanks
• autoclaves
Drying ovens
Maintain stable temperature to prevent product burning.
Textile dyeing
Precise temperature control for uniform color.
Food processing
CIP temperature stabilization, pasteurizer.
Practical Experience
A common factory error:
• Using on/off valves to control temperature
• Strong temperature fluctuations
• Steam hammering
• Continuous hunting
• Steam loss
After replacing with Spirax Sarco globe control valves:
✔ More stable temperature
✔ Reduced steam loss
✔ Increased equipment lifespan
✔ Reduced PLC control errors
This is real-world data from boiler and steam loop systems.
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Application of Spirax Sarco linear valve in industrial boiler systems
Technical advantages
• Precise modulating control • Low seat leakage • Stable CV • Good linear characteristic • High heat resistance • Suitable for saturated and superheated steam • PLC compatible
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Positioner helps Spirax Sarco linear valves achieve more precise control
Common Specifications
• Size: DN15 – DN150
• Connection: Flange
• Signal: 4-20mA / 0-10V
• Actuator: Pneumatic
• Medium:
o Steam
o Hot oil
o Hot water
• Temperature: up to 350°C
• Pressure: PN16 / PN25 / PN40
Phat Dat provides:
✔ Full CO-CQ
✔ Sizing CV consultation
✔ Actuator selection support
✔ Wiring signal support
✔ Nationwide delivery
✔ Installation technical support
✔ Practical experience in many industries
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Actual image of Spirax Sarco linear control globe valve at Phat Dat
FAQ
Can Spirax Sarco valves be used for hot steam?
Yes. This is a strength of the company.
Does it have a 4-20mA signal?
Yes.
Can it be used for heat transfer oil?
Yes.
Are there sizes DN25, DN40, DN50?
Yes, all sizes are available.
Does it support CV selection?
Yes.
Are you looking for a linear valve for:
• Boiler • Calorifier • Heating tank • Steam coil • Heat exchanger • Contact Phat Dat for advice on the right size, CV, control signal, and actual application.
PHAT DAT TRADING ENGINEERING SERVICE COMPANY