Pneumatic Butterfly Valve D671X-16P

D671X-16P Pneumatic Butterfly Valve

Product Specifications

Structure and Application

The D671X-16P pneumatic clamp butterfly valve adopts a midline clamp disc structure, which is designed for automatic opening and closing or flow control of water treatment, food, chemical, and general industrial pipelines. Shorten the installation length of the wafer-type valve body, and use a locator to receive control signals and stabilize the valve plate opening. Project selection should not only be based on the connection diameter, but should also synchronously confirm the medium state, design pressure, normal temperature, maximum pressure difference, operating frequency, allowable leakage level, and on-site control signals to avoid mismatch between valve mechanical capabilities and system operating conditions.

Specifications and materials

The nominal diameter of this model covers DN50-DN300, with a pressure rating of PN10/PN16. The valve body material can be configured according to CF8/CF8M. Material selection should take into account the corrosiveness of the medium, chloride ion content, erosion particles, and environmental temperature; When there are low temperature, high temperature or frequent thermal cycles, the material combination of the valve stem, fasteners and packing should also be checked, and the diameter and pressure standards should be unified in the ordering documents.

Sealing and Media

D671X-16P uses EPDM/PTFE soft seal, suitable for temperature range from - 20℃ to 180℃. The choice of sealing pair will affect the closing performance, operating torque, and maintenance cycle. For media such as water, air, and weakly corrosive liquids, the risks of scaling, wear, adhesion, and cavitation should be evaluated separately; When a stricter leakage level is required, the sealing form should be determined under the premise of meeting temperature and pressure difference conditions, and a single material cannot cover all working conditions.

Drive and Control

The driving part adopts a double acting pneumatic actuator and locator, which can be configured with switch quantity, analog quantity, valve position feedback, limit switch and fault interlock according to the control scheme. The output force or torque of the actuator should have a reasonable safety margin, while verifying the action time and power or gas source conditions. The protection level of control cabinets, junction boxes, and accessories should be suitable for indoor, outdoor, humid, or hazardous environments.

Installation requirements

Before installation, the nameplate parameters, flow direction identification, connection dimensions, and random files should be checked, and welding slag, iron filings, and sealing residues in the pipeline should be removed. The pipelines at both ends of the valve must be coaxial and independently supported, and it is forbidden to forcefully straighten them with fastening bolts. When lifting, the valve body or designated lifting point should be selected, and cables, air pipes, handwheels, and actuator housings should not be used as load-bearing points.

debugging method

The first debugging requires completing a full stroke test under safe isolation conditions, recording the switch position, action time, feedback signal, operating current or gas source pressure. The adjustment purpose should also check the correspondence between the input signal and the actual valve position, and if necessary, perform zero point, range, and dead zone calibration. When encountering jamming, abnormal noise, vibration, or misalignment, the continuous operation should be stopped and the mechanical or control cause should be identified.

operation and maintenance

After being put into operation, a spot check cycle can be established based on the cleanliness of the medium and the number of actions, with a focus on inspecting connecting bolts, valve stem areas, sealing surfaces, actuators, limit devices, and electrical or pneumatic accessories. If there is external leakage, internal leakage, slow response or valve position drift, the problem should be judged based on the process trend to determine whether it comes from the valve internals, driving device or control circuit, in order to avoid increasing the driving force without diagnosis.

Maintenance safety

Before maintenance, the process medium must be cut off, the pressure in the valve chamber must be released, and all power sources must be isolated. During the disassembly process, record the direction and pre tightening status of the parts, and after replacing the seals, tighten them evenly in the prescribed order. Static sealing, movement, and interlocking checks should be conducted before reusing; When dealing with high temperature, flammable or toxic media, on-site work permits, replacement and testing requirements must also be followed.

Selection Guide

Quick opening and closing, valve position feedback, and clamp installation are the main application features of this product, but actual performance depends on correct caliber calculation, material selection, and control parameters. For transient conditions such as minimum flow rate, bypass operation, pump start stop, or system water hammer, they should be jointly reviewed by the process and self-control specialties. The project documentation should clearly state the medium name, flow range, upstream and downstream pressure, and failure location to facilitate the formation of traceable selection criteria.

order proposals

Fouten Flow Control (Jiangsu) Co., Ltd. suggests providing operating condition data sheets, pipeline grades, connection standards, control signals, and accessory lists when purchasing D671X-16P. After arrival, verify the physical object and technical agreement, and save the debugging records and vulnerable parts information. By standardizing selection, installation, commissioning, and periodic maintenance, the operational stability of pneumatic butterfly valves in water treatment, food, chemical, and general industrial pipelines can be improved, and the risk of unplanned shutdowns can be reduced.