Pneumatic high-pressure ball valve Q641F-25P

Product Features

Flange connection, quick cut-off, and optional gas loss position

Model number

Q641F-25P

Specification and caliber

DN15-DN150

Pressure level

PN25

Material

CF8/CF8M

Product Introduction

Q641F-25P Pneumatic High Pressure Ball Valve

Pneumatic high-pressure ball valve Q641F-25P is used for automatic switching or process control in equipment matching, chemical pipelines, water treatment, and general automation. 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

Q641F-25P adopts a two-piece straight channel, flange connection, and floating ball structure. 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 opening and closing and cutting; If the project requires continuous adjustment, it should be confirmed separately whether the ball core flow channel, valve seat structure, and actuator are suitable for throttling conditions. It cannot be recognized as a regulating valve just because the actuator can stay in the middle position. 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 power supply requirements (such as configuration), protection level, and fault safety position of accessories such as gas source pressure, control signals, and solenoid valves or locators should be clearly defined during the ordering stage to avoid interface mismatch on site.

Material and sealing

The commonly used caliber is DN15-DN150, the pressure rating is PN25, and the valve body material can be selected as CF8/CF8M. The selection of materials should take into account the corrosiveness of the medium, chloride ions, temperature fluctuations, and cleaning conditions. Enhance the PTFE soft seal, and its allowable temperature, pressure difference, and leakage level 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	Q641F-25P
Structural form	Two piece straight channel, flange connection, floating ball structure
Nominal Diameter	DN15-DN150
pressure rating	PN25
Valve body material	CF8/CF8M
sealing form	Enhance PTFE soft seal
Drive Type	Double acting or single acting pneumatic actuator
Applicable temperature	-20℃ to 180℃, confirm according to the sealing material
Applicable Medium	Water, oil, gas, and compatible process media

Applicable working conditions

The product features include flange connection, quick cutting, and optional gas loss position. After reasonable configuration, it can be used for equipment matching, chemical pipelines, water treatment, and general automation. 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. Reserve maintenance space around the actuator, and protect the cable entrances of electrical accessories such as solenoid valves and limit switches according to the on-site environment; Pneumatic accessories should use a clean and dry air source that meets the requirements of the actuator. 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 air source, filter pressure reducing valve, solenoid valve or positioner (if configured), limit feedback and pneumatic 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 Ball Valve

Can Q641F-25P maintain half open and control flow for a long time?

Ordinary opening and closing ball valves should not be throttled for a long time without verification. If continuous flow regulation is required, the suitability of the ball port, valve seat, and actuator should be confirmed based on the flow range, pressure difference, medium, and operating frequency. It cannot be considered a regulating valve simply by increasing the control signal.

When replacing the old flange ball valve with Q641F-25P, is it enough to only check DN and PN?

It is also necessary to verify the flange standard, sealing surface, structural length, valve body and seat materials, as well as the allowable pressure at operating temperature. The installation space and connection bracket of the actuator should also be confirmed together with the site.

Q641F-25P 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 requirements for medium composition, design and operating temperature, maximum and normal pressure, flow range, pipeline standards, operating frequency, gas source pressure, control signals, and accessories such as solenoid valves or positioners, as well as requirements for fault safety location and environmental protection. 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.

For more pneumatic products, please refer toSelection of Pneumatic Ball ValveThe corresponding electric structure can be referred toQ941F-25P electric high-pressure ball valveThe overall selection of ball valves can be found inBall valve manufacturer column。