Pneumatic control butterfly valve D671W-16P

Product Features

Fast action, adjustable opening, clamp connection

Model number

D671W-16P

Specification and caliber

DN50-DN500

Pressure level

PN16

Material

WCB/CF8/CF8M

Product Introduction

D671W-16P Pneumatic Control Butterfly Valve

Pneumatic butterfly valve D671W-16P is suitable for on/off or process control in chemical utilities, thermal systems, and industrial equipment. Before selecting, it is necessary to confirm the composition of the medium, temperature, design pressure, normal and maximum flow rates, pressure difference before and after the valve, connection standards, and control signals. The model cannot be determined solely based on the pipe diameter. The parameters in this article are commonly used configurations and should ultimately be based on project conditions, order confirmation, and manufacturing drawings.

Structure and Drive

D671W-16P adopts clamp connection, metal sealing, and eccentric butterfly plate structure. During operation, the opening and closing components are driven by a double acting or single acting pneumatic actuator to change the flow area and achieve corresponding cutting or adjustment. When it comes to remote control, interlocking, or feedback, the control signal, power or gas source conditions, protection level, fault safety location, and accessory interfaces should be clearly defined during the ordering stage to avoid on-site configuration mismatch.

Material and sealing

The commonly used caliber is DN50-DN500, and the pressure rating is PN16. The valve body material is WCB/CF8/CF8M, and the seal adopts a metal hard seal. The selection of materials must take into account the corrosiveness of the medium, chloride ions, temperature fluctuations, particulate matter, and cleaning conditions; The allowable pressure difference, leakage level, and temperature range need to be checked synchronously. Under conditions of high temperature, easy crystallization, particle content, or frequent operation, the hardness of valve internals, packing structure, and erosion prevention measures should also be confirmed.

Product Specifications

Product Model	D671W-16P
Structural form	Clamp connection, metal seal, eccentric butterfly plate structure
Nominal Diameter	DN50-DN500
pressure rating	PN16
Valve body material	WCB/CF8/CF8M
sealing form	Metal hard seal
Drive Type	Double acting or single acting pneumatic actuator
Applicable temperature	-20℃ to 350℃, confirm according to material combination
Applicable Medium	Water, steam, and general industrial gases

Applicable working conditions

Common features include fast action, adjustable opening, and clamp connection, which can be used in chemical utilities, thermal systems, and industrial equipment. When used in explosion-proof areas, actuators, limit switches, solenoid valves, or locators should be configured according to the site zoning. When used in food, pharmaceutical, or high-purity media systems, further confirmation of the contact material, surface treatment, and cleaning plan is required; Projects involving flammable, toxic, or highly corrosive media should undergo specialized safety reviews.

Installation and Debugging

Before installation, check the nameplate, flow direction, and connection standards, remove welding slag and hard debris, and avoid transmitting pipeline stress to the valve body. Maintenance space should be reserved around the actuator; The cable entrance of the electric actuator should be waterproof, and the pneumatic accessories should use a clean and dry air source. The first debugging can be carried out by checking the switch position, travel feedback, interlocking logic, and sealing of connection parts in a low-risk state, and then gradually putting them into normal operation.

Operation and maintenance

During operation, action time, valve position feedback, abnormal noise, leakage, and control signals should be recorded. When there is a delay or inability to move in place, the power or gas source, wiring, filter pressure reducing valve, actuator, and control circuit should be checked first, and then the valve stem, valve seat, and seals should be checked. Blindly increasing the driving force is not advisable. Before maintenance, it is necessary to isolate the medium, relieve pressure, and confirm that there is no residual energy; After replacing spare parts, sealing and action tests should be conducted.

Q&A on Selection of Pneumatic Control Butterfly Valve

D671W-16P pipeline is DN50, must the regulating valve also be selected as DN50?

not always. Please provide the minimum, normal, and maximum flow rates, upstream and downstream pressures, media, and temperature. First, calculate Cv/Kv and the available opening range, and then determine the valve diameter; Choosing too large may also make small flow regulation unstable.

Do I need to confirm the input signal and valve position feedback when connecting D671W-16P to DCS?

It is necessary to confirm the control input, valve position feedback, power or gas source conditions, interfaces, and fault location separately. Input and feedback are not the same function, and it cannot be assumed that all analog signals or communication protocols are fully equipped based solely on the name "regulating type".

D671W-16P needs to be turned off after gas interruption. How should the actuator be configured?

The safety position required for the process in case of gas loss should be clarified first, and then the single or double acting scheme, output force or torque, and accessory circuit should be checked. You cannot select cylinders based solely on valve diameter, nor can you assume that all pneumatic configurations will close when there is a loss of air.

Selection and ordering information

Suggest providing the name and composition of the medium, design and operating temperature, maximum and normal pressure, flow range, pipeline standards, operating frequency, control signals, power or gas supply conditions, fault safety location, and environmental protection requirements. Fouten Flow Control (Jiangsu) Co., Ltd. can be used to verify the caliber, material, seal, actuator, and accessory combination, retaining technical basis for installation and maintenance.