Tianjin Tangfa Watts Valve Co., Ltd.(TFW VALVE) was established in 2002 , registered capital of 10.8 million RMB. The company was formerly known as Tianjin Tangfa watts valve Sales Co., Ltd. TFW valve are mainly dedicated to the development, production and sales of medium and low pressure soft seal valves. The main products include: concentric butterfly valve, flange butterfly valve,metal seated butterfly valve, soft seal gate valve, hard seal gate valve, Gost gate valve,dual plate check valve, swing check valve, Y strainer and other products. The annual production capacity is over 8,000 tons.
TFW valve are mainly oriented to the international market, with sales in the international market accounting for more than 90%. Production models include the production and sale of private brand TFW, IMGV. And the production of OEM orders. The sales market mainly includes the United States, Canada, Southeast Asia, the Middle East, India and Pakistan, the United Kingdom, France, Italy, Russia and
TFW IMGV VALVE
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TFW IMGV VALVE
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TFW IMGV VALVE
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TFW IMGV VALVE
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TFW IMGV VALVE
In industrial production and daily life, butterfly valves play a crucial role as key devices for controlling fluid flow. The torque of a butterfly valve is an important performance indicator, directly impacting ease of operation, reliability, and lifespan. A deeper understanding of butterfly valve torque is essential for improving operational efficiency.
What is Butterfly Valve Torque?
Butterfly valve torque refers to the torque required to open or close the valve. It is generated by the combined effects of friction between internal components such as the seals, stem, and valve body, as well as fluid pressure. The magnitude of butterfly valve torque depends on several factors, including valve size, operating pressure, fluid medium, and temperature. It is typically measured in Newton-meters (N·m).
Importance of Butterfly Valve Torque
The torque setting of a butterfly valve directly impacts its smooth operation, sealing quality, and durability. Proper torque reduces wear, prevents leaks, protects actuators, and aids in energy efficiency. A well-set torque ensures stable and reliable valve performance.
Five Factors Influencing Torque in Concentric Butterfly Valves
Seat Torque
Friction force when the valve disc disengages from the elastic seat.
Bearing Torque
Friction between the bushing surface and the shaft.
Dynamic Torque
Force exerted on the valve disc by the fluid flowing through the valve. Dynamic torque is generally not a primary concern for elastomer-seated butterfly valves unless the flow rate exceeds 6 m/s, in which case dynamic torque should be considered when selecting an actuator.
Valve Size and Pressure Rating
The larger the valve size, the greater the torque required. Similarly, higher pressure ratings increase the torque.
Fluid Properties
Characteristics of the fluid, such as viscosity, density, and temperature, impact the butterfly valve's torque.
Methods for Measuring Butterfly Valve Torque
Using a Torque Wrench
Operate the valve manually with a torque wrench and record the required torque value. This method is suitable for manual valves but requires consistent measurements.
Electronic Torque Sensor
Install an electronic torque sensor on the valve's operating shaft to record real-time torque values during opening and closing. This method is highly accurate and suitable for large or automated valves.
Hydraulic Testing Equipment
For hydraulically operated valves, hydraulic testing equipment can measure torque by controlling system pressure, providing torque values at different operational states.
Actuator-Built-in Torque Measurement
Some electric or pneumatic actuators have built-in torque measurement capabilities, automatically recording torque data during valve operation. This method is ideal for automated systems, offering real-time and precise data.
Calculation Method
The calculation method determines the opening torque by theoretically calculating based on valve structure parameters, fluid properties, and operating conditions.
Note:
When calculating valve torque, it’s essential to consider friction between the valve disc and seat, friction between the stem and packing, and the thrust exerted on the disc by different pressure differentials. Due to the wide variety of materials for the disc, seat, and packing—each with unique friction coefficients, contact areas, and compression levels—calculated torque values serve as a reference but are affected by numerous factors. Therefore, actual measurement is generally preferred over theoretical calculation.
Total torque can be calculated as follows:
Ta = Ts + Tb + Td
Where:
Ta : The required actuator torque
Ts=Seat Torque
Tb=Bearing Torque
Td=Dynamic Torque
Tb = Qc * fC * Ds / 2
Where:
P=Normal Pressure
Fc=Fricton Coefficient
Ds=Shaf Diameter
Td = Ct * D3 *△ P
Where:
Td=Dynamic Torque Coefficient
D=Valve Normal Diameter
△ P=Pressure Drop
Ts = Qm * R / 1000
Where:
Qm=Fricton of Sealing Face
Qc=Bearing Loading
R =Radius Disc
Example Table of Butterfly Valve Torque
Torque specifications are based on optimum test conditions. Actual torques may vary under different field and environmental applications.
The torque figures provided represent the required torque to open and re-seat the valve. The figures provided are based upon water and other lubricating fluids, and include a factor of safety.
Table 1:Rubber Seat Butterfly valve torque chart example
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