The flanged globe valve relies on the pressure exerted by the valve stem to ensure a tight seal between the valve disc's sealing surface and the valve seat's sealing surface, thereby preventing the flow of media. During the opening and closing process, the friction between the sealing surfaces is minimal; consequently, the valve exhibits excellent wear resistance, requires a relatively short opening stroke, and features superior manufacturing quality and performance characteristics. It is one of the most widely utilized types of valves across various industrial sectors.
**Product Features:**
1. The structural design of the globe valve is relatively simple, making both manufacturing and maintenance processes convenient.
2. The sealing surfaces are resistant to wear and abrasion, ensuring excellent sealing performance and a long service life.
3. The valve disc requires a relatively short stroke to open or close, resulting in rapid operation times.
**Product Selection Standards:**
Design Standard: GB12235; Structural Length: GB12221; Connection Flanges: JB79; Testing and Inspection: GB/T 13927; Pressure/Temperature Ratings: GB 9131.
**Main Component Materials and Properties:**
Body and Bonnet: WCB, WC1, WC6, WC9, ZGCr5Mo, 12Mo2Ti
Valve Stem: 2Cr13, 38CrMoAl, 25Cr2MoV, 1Cr18Ni12Mo2Ti
**Operating Principles and Structural Description:**
1. When the handwheel is rotated in a clockwise direction, the valve stem moves downward, causing the valve disc to descend and engage with the seat, thereby sealing the flow passage. When rotated in the counter-clockwise direction, the valve opens; as the valve stem is raised to its uppermost position, the "upper seal" mechanism becomes active.
2. This specific flanged globe valve incorporates an additional "upper seal" feature. When the valve is in the fully open position, this upper seal works in conjunction with the packing material to provide a dual-layer sealing effect, while also offering a degree of protection for the packing itself.
3. This valve utilizes nylon-based materials for its sealing surfaces. The stem packing consists of soft, pre-formed packing material, and the upper seal is also constructed from soft-sealing materials, collectively ensuring superior sealing performance.
