Pneumatic triple eccentric butterfly valve D643H-16C

Pneumatic Three Eccentric Butterfly Valve D643H-16C Product Description

Pneumatic triple eccentric butterfly valve D643H-16C is designed for automatic cut-off or process regulation needs in energy, petrochemical, thermal pipeline networks, metallurgy, and industrial furnace systems. When selecting, the composition of the medium, working temperature, maximum and normal flow rates, pressure before and after the valve, pipeline connection standards, operating frequency, and fault safety position should be checked first. The diameter cannot be directly applied based on the existing diameter. The parameters in this article are within the commonly used configuration range, and the final data should be based on the project operating conditions, technical confirmation form, and manufacturing drawings.

Product Specifications

Structure and working mode

D643H-16C adopts three eccentric butterfly plates, flange connections, and metal hard seals. After the fluid enters the valve body, the pneumatic actuator is equipped with a manual emergency device to change the position of the opening and closing parts, thereby completing the cutting, reversing or continuous adjustment. The actuator should be selected based on the maximum working pressure difference, valve stem thrust, or output torque, with a reasonable safety factor. When remote feedback, positioning, or interlocking is required, the control signal, power or gas source, switch time, power and gas loss position, and protection level should be clearly defined to avoid inconsistencies between on-site interfaces and control logic.

Caliber pressure and material

The commonly used nominal diameter is DN80-DN1200, the pressure rating is PN10/PN16/PN25, and the valve body can be selected as WCB/CF8/CF8M. Material selection needs to consider corrosion resistance, chloride ion content, temperature cycling, medium cleanliness, and external environment simultaneously. The allowable temperature, pressure difference, and leakage level of multi-layer stainless steel and flexible graphite composite seals should be checked synchronously; The hardness, erosion allowance, and packing structure of the valve core and seat should also be confirmed for conditions involving particles, easy crystallization, or high-frequency operation.

Product Features and Applications

The main features of this product are low opening and closing friction, high temperature resistance, and stable flange connection. After reasonable configuration, it can be used in energy, petrochemical, thermal pipeline networks, metallurgy, and industrial furnace systems. The adjustment purpose needs to be combined with the flow characteristics and adjustable ratio to calculate the valve opening, while the cut-off purpose should focus on confirming the allowable leakage amount and action time. Dangerous areas should select actuators, locators, solenoid valves, and limit switches according to the on-site explosion-proof zoning; When dealing with highly corrosive, toxic, or flammable media, specialized material and safety reviews should also be conducted.

Installation and commissioning

Before installation, the nameplate, flow direction, flange or clamp standards should be checked, welding slag and hard debris in the pipeline should be removed, and the front and rear pipe sections should be concentric. It is forbidden to use valves to forcibly correct pipeline deviations. Space for disassembly and assembly should be reserved around the actuator, cable entrances should be protected from rainwater backflow, and pneumatic accessories should use clean and dry air sources. For the first debugging, it is advisable to check the fully open and fully closed positions, travel feedback, interlock logic, sealing condition, and abnormal noise under low-risk conditions, and then gradually increase 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, 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 seal, conduct strength, sealing, and action tests according to regulations, and record the material and maintenance date of the spare parts.

Q&A on the selection of pneumatic triple eccentric butterfly valve

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.