Pneumatic Butterfly Valve DK67-WB

Product Features

Clamp installation, PTFE valve seat, pneumatic quick cut-off

Model number

DK67-WB

Specification and caliber

DN50-DN400

Pressure level

PN10/PN16

Material

ductile cast iron

Product Introduction

Pneumatic Butterfly Valve DK67-WB Product Description

The pneumatic butterfly valve DK67-WB is suitable for automatic switching, switching, or process control in water treatment, chemical engineering, food utilities, and general industrial systems. Before determining the configuration, a comprehensive judgment should be made based on the composition of the medium, operating temperature, maximum and normal flow rates, pressure before and after the valve, connection standards, operating frequency, and control signals. The model cannot be directly determined based solely on the existing pipe diameter. The following parameters are commonly used configuration ranges, and actual supply should be based on project conditions, technical confirmation forms, and manufacturing drawings.

Product Specifications

Product Model	DK67-WB
Structural form	Clamp connection, cast iron valve body, PTFE valve seat
Nominal Diameter	DN50-DN400
pressure rating	PN10/PN16
Valve body material	ductile cast iron
sealing form	PTFE or EPDM soft seal
Drive Type	Double acting or single acting pneumatic actuator
Applicable temperature	-10℃ to 150℃, confirm according to the sealing material
Applicable Medium	Water, oil, air, and compatible media

Structure and working mode

DK67-WB adopts clamp connection, cast iron valve body, and PTFE valve seat. During operation, the opening and closing components are driven by a double acting or single acting pneumatic actuator to change the flow cross-section, achieving cutting, reversing, or adjustment. The actuator should be selected according to the maximum pressure difference, valve stem thrust or output torque, and a reasonable margin should be reserved. When remote feedback, proportional adjustment, or interlocking is required, the control signal, power or gas supply conditions, protection level, action time, and fault safety position should be clearly defined during the ordering stage to avoid inconsistencies between accessory interfaces and on-site control logic.

Caliber pressure and material selection

The commonly used nominal diameter is DN50-DN400, and the pressure rating is PN10/PN16. The valve body material can be selected as ductile iron, and its adaptability needs to be confirmed in combination with the corrosiveness of the medium, temperature cycling, particle content, and external environment. The allowable temperature, pressure difference, and leakage requirements for PTFE or EPDM soft seals should be checked synchronously. For pipelines that are prone to crystallization, contain particles, frequently move, or have significant temperature changes, the wear resistance of valve internals, packing structure, support method, and erosion prevention measures should also be confirmed.

Product features and applicable industries

The main features of this product include clamp installation, PTFE valve seat, and pneumatic quick cut-off. After reasonable configuration, it can be used for water treatment, chemical supporting facilities, food utilities, and general industrial systems. When dealing with flammable, explosive, highly corrosive, high-temperature, or toxic media, explosion-proof actuators, locators, solenoid valves, limit switches, and corresponding materials should be selected according to site specifications, and general parameters should not replace special safety reviews.

Installation and Debugging

Before installation, the nameplate, flow direction, connection standard, and sealing surface should be checked, welding slag and hard debris in the pipeline should be removed, and the front and rear pipe sections should be ensured to be concentric. It is forbidden to use valves to forcibly correct pipeline deviations. Maintenance space should be reserved around the actuator, cable entrances should be protected from rainwater backflow, and pneumatic accessories should use clean and dry air sources. The first debugging should be carried out under low-risk conditions to check the fully open and fully closed positions, travel feedback, interlocking logic, sealing condition, and abnormal noise, and then gradually increase to the working pressure.

operation and maintenance

During operation, action time, valve position feedback, leakage, pressure difference, and control signals should be recorded. If the action is slow or the switching is not in place, the power or gas source, wiring, filter pressure reducing valve, locator, and actuator 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 the seals, conduct strength, sealing, and action tests according to regulations, and keep records of spare parts materials and maintenance.

Q&A on Selection of Pneumatic Clamp Butterfly Valve

How to choose a soft sealing ring for DK67-WB in contact with oil media?

It is necessary to specify the specific oil product, temperature, pressure, and cleaning medium, and verify the compatibility between the valve seat and the seal. Applicability cannot be judged solely based on whether the valve body is made of stainless steel or ductile iron, nor can different rubber materials be directly interchanged.

What dimensions should be checked when installing DK67-WB between the original pipeline flanges?

It is necessary to verify the matching flange standard, inner diameter, bolt holes, and sealing structure, and check the gap between the butterfly plate and the pipeline or adjacent valve components when fully opened. The same DN cannot replace the verification of installation dimensions.

DK67-WB 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.

Order Information List

Suggest providing the 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, fail safe location, and environmental protection requirements. Fouten Flow Control (Jiangsu) Co., Ltd. will verify the caliber, material, seal, actuator, and accessory combination based on these materials to ensure that the product parameters are consistent with the actual pipeline conditions, and provide traceable basis for subsequent installation and maintenance.