Pneumatic soft seal butterfly valve D671X-16Q

Product Features

Installation of clamps, quick action, and optional loss of air position

Model number

D671X-16Q

Specification and caliber

DN50-DN600

Pressure level

PN16

Material

Ductile iron/carbon steel

Product Introduction

D671X-16Q Pneumatic Soft Seal Butterfly Valve

Pneumatic soft seal butterfly valve D671X-16Q is used for automatic switching or process control in water supply and drainage, HVAC, water treatment, and municipal engineering. The selection should check the medium, temperature, maximum and normal flow rates, pressure difference before and after the valve, pipeline standards and control requirements, and should not be based solely on the existing pipe diameter. This article lists the commonly used configuration range, and the final data should be based on project conditions, order confirmation forms, and manufacturing drawings.

Structure and Drive

D671X-16Q adopts clamp connection, center butterfly plate, and elastic valve seat. When the fluid passes through the valve body flow channel, the position of the opening and closing parts is changed by a double acting or single acting pneumatic actuator to complete the cutting or adjustment. The actuator should match the torque or thrust of the valve and reserve a reasonable safety factor. When feedback, positioning, or interlocking is required, the control signal, power or gas source, protection level, and fault safety location should be clearly defined during the ordering phase to avoid on-site interface mismatch.

Material and sealing

The commonly used caliber is DN50-DN600, the pressure rating is PN16, and the valve body material can be selected from ductile iron/carbon steel. The selection of materials should take into account the corrosiveness of the medium, chloride ions, temperature fluctuations, and cleaning conditions. EPDM or NBR soft seals should have their allowable temperature, pressure difference, and leakage level checked simultaneously. For steam, particle containing, easily crystallized or frequently operated conditions, the hardness of valve internals, packing form and erosion prevention measures should also be confirmed.

Product Specifications

Product Model	D671X-16Q
Structural form	Clamp connection, center butterfly plate, elastic valve seat
Nominal Diameter	DN50-DN600
pressure rating	PN16
Valve body material	Ductile iron/carbon steel
sealing form	EPDM or NBR soft seal
Drive Type	Double acting or single acting pneumatic actuator
Applicable temperature	-10℃ to 120℃, confirm according to the sealing material
Applicable Medium	Water, air, and general non corrosive media

Applicable working conditions

The product features include clamp installation, quick action, optional air loss position, and can be used for water supply and drainage, HVAC, water treatment, and municipal engineering after reasonable configuration. Dangerous areas should select corresponding actuators, accessories, and wiring methods according to explosion-proof zones; Food, pharmaceutical and other systems also need to confirm the requirements for liquid receiving materials, surface treatment and cleaning. Projects involving oxygen, highly corrosive or toxic media should undergo specialized material and safety reviews.

Installation and Debugging

Before installation, the nameplate, flow direction, and connection standards should be checked, and welding slag and hard debris should be removed to ensure the concentricity of the front and rear pipe sections and avoid the transmission of pipeline stress to the valve body. Maintain maintenance space around the actuator, and prevent rainwater from entering the cable entrance; Pneumatic accessories should use a clean and dry air source. The first debugging should check the switch position, stroke feedback, interlocking logic, and sealing condition under low-risk conditions, and then gradually enter the working pressure.

Operation and maintenance

Observe action time, abnormal noise, leakage, valve position feedback, and control signals during operation. When the action is slow, first check the power or gas source, wiring, filter pressure reducing valve, and actuator, and then check the valve stem, valve seat, and seals. It is not advisable to blindly increase the driving force. 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 of the spare parts and the date of maintenance.

Q&A on selection of pneumatic soft seal 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.

Can D671X-16Q directly replace the original flange butterfly valve?

Please provide the connection standard, structural length, sealing surface, and on-site space of the old valve, and verify the driving height and flow direction requirements of the new valve. It cannot be determined that direct replacement can be made solely based on the same caliber and nominal pressure.

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.

Selection and ordering information

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 this, providing traceable basis for installation and maintenance.