Pneumatic high-pressure gate valve Z641H-25C

Product Features

High voltage level, pneumatic control, interlocking opening and closing

Model number

Z641H-25C

Specification and caliber

DN50-DN500

Pressure level

PN25

Material

WCB

Product Introduction

Z641H-25C Pneumatic High Pressure Gate Valve

Pneumatic high-pressure gate valve Z641H-25C is used for automatic switching or process control in thermal pipelines, boiler auxiliary equipment, energy devices, and industrial pipelines. 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

Z641H-25C adopts flange connection, wedge gate, and rising rod structure. When the fluid passes through the valve body channel, the pneumatic actuator is paired with a switching mechanism to change the position of the opening and closing parts, completing 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-DN500, the pressure rating is PN25, and the valve body material can be selected as WCB. The selection of materials should take into account the corrosiveness of the medium, chloride ions, temperature fluctuations, and cleaning conditions. The allowable temperature, pressure difference, and leakage level of metal seals should be 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	Z641H-25C
Structural form	Flange connection, wedge gate, and exposed rod structure
Nominal Diameter	DN50-DN500
pressure rating	PN25
Valve body material	WCB
sealing form	metal seal
Drive Type	Pneumatic actuator with conversion mechanism
Applicable temperature	-20℃ to 425℃, confirm according to the packing and valve seat
Applicable Medium	Steam, hot water, oil products, and general industrial gases

Applicable working conditions

The product features include high pressure rating, pneumatic control, interlocking opening and closing. After reasonable configuration, it can be used for thermal pipelines, boiler auxiliary equipment, energy devices, and industrial pipelines. 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 High Pressure Gate Valve

Can Z641H-25C be used with a half open valve instead of a regulating valve to control flow?

Ordinary cut-off gate valves should not be directly treated as continuous regulating valves. Long term semi opening may cause erosion or vibration to the gate and valve seat; It should be clarified whether the process requires opening and closing isolation or continuous regulation before selecting the corresponding valve type.

How much maintenance space is needed for Z641H-25C installed under the equipment?

The full stroke height of the valve stem, bracket, and actuator should be checked according to the specific assembly drawing, and space for disassembly and assembly should be reserved; The length of the valve body alone cannot be used to determine whether it can be installed. The visible stem structure also needs to be checked for interference between the valve stem extension path and the equipment.

Z641H-25C 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.