The manual tilting‑stem reactor bottom discharge valve is a manually‑operated discharge valve specially designed for bottom‑discharge service of reactors, mixing tanks, storage tanks and other pressure vessels. Adopting a tilting‑type body structure, its flow passage forms an optimized discharging angle with the tank bottom, which effectively reduces material residue inside the valve cavity and outlet.
As a quarter‑turn (90° rotary) ball valve, this valve is flange‑mounted at the bottom outlet of reactors and storage tanks. Its stem is installed at an inclined angle (commonly 45°/60°‑105°) to avoid installation interference caused by tank‑bottom jackets and support brackets. It is primarily applied for process media with high viscosity, high sedimentation tendency, solid‑particle contents and working conditions requiring complete tank draining.
Working Principle of Manual Tilting‑Stem Reactor Bottom Discharge Valve (Angle Stem Tank‑Bottom Ball Valve)
Closed Position：The lever handle rotates the inclined stem to turn the ball to the closed position. The curved surface of the ball sits flush with the inner wall of the reactor bottom without raised dead‑zones. The side of the ball presses tightly against the valve seat to form a tight seal, preventing medium discharge and sustaining internal tank pressure.
Opening & Discharging：Manually turn the lever handle, which drives the inclined stem to rotate the ball by 90°. The bore of the ball fully aligns with the bottom discharge passage to create a full‑port flow path. Materials inside the tank flow downwards smoothly by gravity. The unrestricted full‑bore passage under fully‑open status greatly reduces clogging risks for slurry, viscous fluids and particle‑laden media.
Shut‑off & Closure：Reverse‑rotate the lever handle by 90°, the ball bore is offset from the flow channel. The ball re‑seats firmly against the valve seat to cut‑off medium flow and complete the discharging operation.
Manual ball valves are widely used on piping systems for fast opening and closing, to cut off or connect fluid media stably. Accurate parameter confirmation including working temperature, medium, pressure and caliber is required before ordering for correct valve selection. Customized solutions on valve size, pressure rating, connection standard and body material are available to meet diverse non-standard working conditions.（Unit: mm）
| DN | NPS | XGFLQ41F | Part No | L | D | D1 | D2 | C | t | N-z | T | E | A | B | H | H1 | K*K |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 1 | XGFLQ41F-150LB | XGFLQ41F150XLX1 | 110 | 115 | 85 | 65 | 18 | 2 | 4-14 | 21 | 130 | 50 | 42 | 83 | 12 | 11 |
| 32 | 1.25 | XGFLQ41F-150LB | XGFLQ41F150XLX125 | 116 | 140 | 100 | 78 | 18 | 2 | 4-18 | 21 | 150 | 50 | 42 | 95 | 12 | 11 |
| 40 | 1.5 | XGFLQ41F-150LB | XGFLQ41F150XLX15 | 140 | 150 | 110 | 85 | 18 | 2 | 4-18 | 20 | 150 | 70 | 50 | 123 | 15 | 14 |
| 50 | 2 | XGFLQ41F-150LB | XGFLQ41F150XLX2 | 140 | 165 | 125 | 100 | 20 | 2 | 4-18 | 20 | 160 | 70 | 50 | 112 | 15 | 14 |
| 65 | 2.5 | XGFLQ41F-150LB | XGFLQ41F150XLX2.5 | 170 | 185 | 145 | 120 | 20 | 2 | 8-18 | 23 | 180 | 102 | 70 | 125 | 18 | 17 |
| 80 | 3 | XGFLQ41F-150LB | XGFLQ41F150XLX3 | 190 | 200 | 160 | 135 | 20 | 2 | 8-18 | 34 | 220 | 102 | 70 | 132 | 18 | 17 |
| 100 | 4 | XGFLQ41F-150LB | XGFLQ41F150XLX4 | 230 | 220 | 180 | 155 | 22 | 2 | 8-18 | 40 | 230 | 125 | 102 | 160 | 23 | 22 |
| 125 | 5 | XGFLQ41F-150LB | XGFLQ41F150XLX5 | 250 | 250 | 210 | 188 | 22 | 3 | 8-18 | 29 | 278 | 140 | 102 | 186 | 23 | 22 |
| 150 | 6 | XGFLQ41F-150LB | XGFLQ41F150XLX6 | 285 | 285 | 240 | 212 | 24 | 3 | 8-22 | 35 | 327 | 140 | 102 | 210 | 28 | 27 |
| 200 | 8 | XGFLQ41F-150LB | XGFLQ41F150XLX8 | 350 | 340 | 295 | 268 | 24 | 3 | 12-26 | 40 | 406 | 140 | 125 | 295 | 37 | 36 |
The inclined stem design positions the operating handle away from the bottom of the reactor, preventing interference with bottom support legs and thermal insulation jackets during installation. It also reduces the required operating torque, making manual operation easier and more efficient.
The flush-mounted spherical bottom design significantly minimizes material residue and liquid-holding dead zones, ensuring cleaner and more thorough discharge. During ball rotation, the ball provides a slight shearing action that can cut through small amounts of crystallized material and fibrous impurities, helping reduce the risk of blockage and sticking.
