BQ641F Pneumatic Side Mounted Eccentric Hemisphere Valve

BQ641F Pneumatic Side Mounted Eccentric Hemisphere Valve

BQ641F uses a pneumatic actuator to drive the eccentric hemispherical opening and closing components to rotate, achieving pipeline cutting. Side mounted refers to the assembly and maintenance structure of the valve body and internal components, while pneumatic refers to the execution mode; This model does not use the BQ941F electric model. The eccentric hemispherical structure cannot be directly mixed with the O ball valve with a regular intact sphere.

Eccentric structure and medium adaptation

Eccentric motion causes the contact state between the opening and closing components and the valve seat to change with the rotation angle, which can be combined with specific design to improve the opening and closing friction and sealing force. The actual allowable particle size, erosion ability, closing pressure difference, and leakage indicators are jointly determined by the sealing pair, eccentric geometry, and material, and cannot be guaranteed to be suitable for all slurries or zero leakage based solely on the name of the hemispherical valve.

Caliber, pressure, and connection

The series lists DN40-DN1000 and PN16, Class150, JIS10K and other configuration inlets. When ordering, a pressure and flange standard system should be selected, and the sealing surface, structural length, and installation direction should be checked. These grades cannot be interchanged without conditions, and special large-diameter and material combinations need to be verified according to the diagram. The valve body and sealing material shall be confirmed separately according to the composition of the medium, temperature, and degree of abrasion.

Pneumatic drive and accessories

The cylinder is selected according to the maximum operating torque, pressure difference, lower limit of gas source, and operating frequency of the valve, and can be selected as single acting or double acting according to the process. Electromagnetic valves, limit feedback, filter pressure reducers, and locators each have different purposes; When adjusting control, it is still necessary to confirm whether the valve internals and flow characteristics meet the requirements of continuous adjustment, and cannot be assumed to be professional control valves just because a locator is installed.

Installation, debugging, and safety maintenance

Install according to the valve body arrow and confirmation diagram, independently support the pipeline, and reserve space for cylinder and side installation maintenance. Check the air circuit, limit and feedback under non pressure conditions, and then verify the action and sealing according to the approved test procedure. The action time, explosion-proof level, and gas loss location should be verified according to the ordering documents; Isolate, depressurize, drain and lock the gas source before maintenance.