Electric hard seal butterfly valve D943H-16C

Product Features

Triple eccentric low friction, temperature resistance, bi-directional cutting

Model number

D943H-16C

Specification and caliber

DN50-DN1200

Pressure level

PN10/PN16/PN25

Material

WCB/CF8/CF8M

Product Introduction

Electric hard seal butterfly valve D943H-16C Product Description

The electric hard seal butterfly valve D943H-16C is suitable for automatic switching, switching or process control conditions in thermal pipelines, petrochemical plants, metallurgy and energy 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	D943H-16C
Structural form	Triple eccentric butterfly plate, flange connection, metal hard seal
Nominal Diameter	DN50-DN1200
pressure rating	PN10/PN16/PN25
Valve body material	WCB/CF8/CF8M
sealing form	Multi layer stainless steel and flexible graphite composite seal
Drive Type	Angular stroke electric actuator
Applicable temperature	-29℃ to 425℃, confirm according to material combination
Applicable Medium	Steam, hot water, oil products, gases, and general industrial media

Structure and working mode

D943H-16C adopts three eccentric butterfly plates, flange connections, and metal hard seals. During operation, the angle stroke electric actuator drives the opening and closing components 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-DN1200, and the pressure rating is PN10/PN16/PN25. The valve body material can be selected as WCB/CF8/CF8M, 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 multi-layer stainless steel and flexible graphite composite seals should be checked simultaneously. 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 three eccentric low friction, temperature resistance, and bi-directional cutting. After reasonable configuration, it can be used for thermal pipelines, petrochemical plants, metallurgy, and energy 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 electric hard seal butterfly valve

How to confirm the allowable leakage when D943H-16C is used for cutting off?

When ordering, the medium, working temperature, pressure difference, sealing direction, and inspection standards should be clearly defined, and the valve seat material and leakage level should be checked. Hard seal or triple eccentric name does not mean zero leakage in all directions and operating conditions.

Can D943H-16C 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.

Will D943H-16C automatically shut down after a power outage?

The power-off action cannot be determined solely by the name of the electric drive. Ordinary electric actuator cannot default to having automatic valve closing function when power is lost; If the process requires fault closure, the energy storage or other fault safety scheme of the actuator should be confirmed at the time of ordering, and the entire valve interlock verification should be completed.

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.