Pneumatic Butterfly Valve D671X-16Q

Product Features

Compact structure, fast cutting, and adjustable feedback

Model number

D671X-16Q

Specification and caliber

DN50-DN300

Pressure level

PN10/PN16

Material

QT450-10/CF8/CF8M

Product Introduction

Pneumatic Butterfly Valve D671X-16Q Product Description

Pneumatic clamp butterfly valve D671X-16Q is designed for automatic shut-off or process regulation needs in water treatment, environmental protection equipment, HVAC, and general industrial pipelines. 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

Product Model	D671X-16Q
Structural form	Centerline butterfly plate, clamp connection, elastic valve seat
Nominal Diameter	DN50-DN300
pressure rating	PN10/PN16
Valve body material	QT450-10/CF8/CF8M
sealing form	EPDM/NBR/PTFE Soft Seal
Drive Type	Gear rack pneumatic actuator
Applicable temperature	-20℃ to 120℃, confirm according to the valve seat material
Applicable Medium	Water, air, low-pressure gas, and compatible process liquids

Structure and working mode

D671X-16Q adopts a center butterfly plate, clamp connection, and elastic valve seat. After the fluid enters the valve body, the gear rack pneumatic actuator changes the position of the opening and closing components to complete 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 DN50-DN300, the pressure rating is PN10/PN16, and the valve body can be selected as QT450-10/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 EPDM/NBR/PTFE soft seal 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 compact structure, fast cutting, and adjustable feedback. After reasonable configuration, it can be used for water treatment, environmental protection equipment, HVAC, and general industrial pipelines. 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 Selection of Pneumatic Clamp Butterfly Valve

How to choose a soft sealing ring for D671X-16Q 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 D671X-16Q 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.

D671X-16Q 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.