Drain Check Valve
I. Introduction:
The PH44H slag discharge check valve has a structure similar to that of a gate valve, except that it lacks the valve stem that drives the valve disc. The medium flows in from the inlet (lower side) and out from the outlet (upper side). When the inlet pressure is greater than the sum of the valve disc's weight and its flow resistance, the valve opens. Conversely, the valve closes when the medium flows backward. Swing check valves have an obliquely positioned valve disc that can rotate around an axis, and their working principle is similar to that of lift check valves. Check valves are commonly used as the bottom valve of pumping devices to prevent water backflow. When a check valve is used in combination with a gate valve, it can provide safety isolation. Its disadvantages include high resistance and poor sealing when closed.
II. Precautions:
1. Do not let the check valve bear weight in the piping system; large-sized check valves should be independently supported so that they are not affected by the pressure generated by the piping system.
2. During installation, ensure that the direction of medium flow is consistent with the direction of the arrow marked on the valve body.
3. Lift check valves with vertical discs should be installed on vertical pipes.
4. Lift check valves with horizontal discs should be installed on horizontal pipes.
III. Principle and Structure:
The opening and closing parts of a check valve open or close automatically under the action of medium flow and force, preventing medium backflow. Slag discharge check valves belong to the category of automatic valves, mainly used in pipelines where medium flows in one direction, allowing medium to flow in only one direction to prevent accidents. According to their structure, check valves can be divided into three types: lift check valves, swing check valves, and butterfly check valves. Lift check valves can be further divided into vertical and horizontal types. Swing check valves are divided into single-disc, double-disc, and multi-disc types. Butterfly check valves are straight-through type. The above types of check valves can be divided into three connection forms: threaded connection, flange connection, and welding connection.
IV. Main Dimensions and Weights:
Model | Nominal Diameter | Main Dimensions(mm) | Weight | |||||||
L | D | D1 | D2 | Z-φd | b | f | H | |||
PH44H-10C | 80 | 241 | 200 | 160 | 132 | 8-φ18 | 20 | 3 | 260 | 48 |
100 | 292 | 220 | 180 | 156 | 8-φ18 | 20 | 3 | 270 | 63 | |
150 | 356 | 285 | 240 | 212 | 8-φ22 | 22 | 290 | 120 | ||
200 | 495 | 340 | 295 | 268 | 8-φ22 | 22 | 345 | 200 | ||
250 | 622 | 395 | 350 | 320 | 12-φ22 | 24 | 412 | 250 | ||
300 | 698 | 445 | 400 | 370 | 12-φ22 | 26 | 468 | 320 | ||
350 | 787 | 505 | 460 | 430 | 16-φ22 | 28 | 4 | 524 | 400 | |
400 | 900 | 565 | 515 | 482 | 16-φ26 | 30 | 600 | 517 | ||
450 | 918 | 615 | 565 | 532 | 20-φ26 | 32 | 670 | 610 | ||
500 | 978 | 670 | 620 | 585 | 20-φ26 | 34 | 750 | 705 | ||
V. Materials of Components:
Component Name | Materials | ||||
10C | 16C | 25 | 40 | 64 | |
Valve Body and Bonnet | WCB | ||||
Valve Seat | WCB with 85Cr-Mn Hardfacing | ||||
Gate Disc | WCB + 85Cr-Mn Hardfacing | ||||
Rocker Arm | 2Cr13 or 1Cr18Ni9Ti | ||||
| Machinery & Equipment/Valves/Check Valves | |
