A manual V-port flanged ball valve is a V-port ball valve that uses a flanged connection and is operated by a manual handle or gear mechanism. Its ball has a V-shaped notch cut into it; when the ball rotates, it creates a wedging shear force against the seat, effectively cutting through fibers and particles, preventing valve blockage, and providing a self-cleaning capability. The valve body adopts an integral structure for high rigidity, and the flanged connection ensures stable installation and easy removal. Its flow characteristic is approximately equal-percentage, with a typical rangeability of 100:1 to 300:1 and high regulating precision; the sealing form can be selected according to working conditions as either metal hard sealing (high temperature resistance, wear resistance) or PTFE soft sealing (good sealing performance, corrosion resistance). In terms of main technical parameters, nominal diameter is generally DN25 to DN500, nominal pressure PN10 to PN64 or 150LB to 300LB, applicable temperature -29°C to 350°C (depending on sealing material), connection type is flanged, actuation is manual (handle or worm gear; pneumatic or electric actuators also available), common materials include carbon steel and 304/316 stainless steel, leakage class for hard sealing can reach Class IV and V and for soft sealing Class VI, and design standards cover GB/T 9113, ASME B16.5, ISA S75.04, etc. The valve is widely used in petroleum, chemical, papermaking, wastewater treatment, power, metallurgy, and pharmaceutical industries, especially for flow control of media such as pulp, sludge, and particle-containing slurries. When selecting, it is necessary to choose the appropriate body material, sealing form, and operation mechanism based on medium characteristics (such as corrosiveness and whether particles are present), temperature and pressure, flow range, and leakage class requirements; during installation, the valve should be installed with the pipeline properly aligned, the flange bolts evenly tightened, and the handle or gear mechanism positioned for convenient operation, while ensuring there is no welding slag or other debris in the pipeline; among common faults, leakage at the packing or flange can usually be solved by tightening nuts or replacing gaskets/sealing rings, while valve core sticking is mostly caused by impurities or insufficient operating torque and requires cleaning or replacement of the operating mechanism.