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The J744X Piston-type Sludge Valve is a specialized valve designed for rapid, high-flow sludge discharge in water treatment structures such as sedimentation tanks and sludge tanks. The J744X features an angle structure with a vertical inlet connected to the tank bottom and a horizontal outlet, while the J644X adopts a straight-through design. Its core mechanism uses hydraulic or pneumatic cylinders to drive internal pistons, which are converted into rapid valve flap rotation or lifting motion through a unique mechanical fork or cam lever mechanism at the valve opening instant, achieving a "burst-type" quick opening. This valve instantly releases the static pressure at the tank bottom, generating strong flushing force to prevent sludge compaction and clogging, making it a key device for efficient, automated sludge discharge operations.

Product Image:JM744X Piston-type Sludge Valve
Feature
1.Efficient piston-driven mechanism:Using a hydraulic or pneumatic cylinder as the power source, it provides strong output thrust and stable operation. The rapid response of the piston ensures that the valve can create a strong flush using static pressure at the moment of opening, effectively preventing sludge accumulation at the port.
2.No-dead-zone angle flow path design:The valve body features a right-angle streamlined design with a smooth internal cavity and no retention points, ensuring high flow capacity and low resistance. This structure prevents scale build-up and residue retention, significantly reducing the risk of jamming or seat damage.
3.Excellent sealing performance:The seat and disc sealing pair are made of high-quality rubber or specialized synthetic materials, precision-machined to achieve bubble-tight shut-off in the closed position. It maintains superior erosion resistance and zero-leakage performance even in harsh media containing fine sand or fibers.
4.Simple structure and convenient maintenance:The integrated design of the actuator and valve body features few parts and high interchangeability. The top-entry structure allows for online inspection and replacement of piston rings or gaskets without removing the valve body from the pipeline, significantly shortening maintenance downtime.
5.Long-term corrosion resistance and durability:The valve body is available in ductile iron, carbon steel, or stainless steel, with internal and external surfaces treated with high-performance epoxy coatings. It possesses exceptional water erosion and weather resistance, ensuring stable long-term operation in humid sedimentation tank environments.

Structural Drawing:JM744X Piston-type Sludge Valve
Component Name Material List
| SNO | Part Name | Common materials |
| 1 | body | gray cast iron, ductile cast iron, cast steel, stainless steel (304/316) |
| 2 | bonnet | gray cast iron, ductile cast iron, cast steel, stainless steel |
| 3 | piston | ductile iron, carbon steel + rubber coating, stainless steel |
| 4 | driving cylinder (hydraulic cylinder / pneumatic cylinder) | HT200 gray cast iron, 304 stainless steel |
| 5 | stem | chromium stainless steel, 304 stainless steel |
| 6 | disc/plate | Ductile iron, bronze, carbon steel + nitrile rubber |
| 7 | sealing ring/sealing gasket | Nitrile rubber, nylon-reinforced rubber, fluororubber |
| 8 | diaphragm | nylon reinforced rubber |
| 9 | diaphragm pressure plate | ductile iron, bronze |
| 10 | sealing | copper alloy, cemented carbide, rubber |
Performance Specification Sheet
| Performance Specification Sheet | ||||
| Nominal Pressure | 1.0 | 1.6 | 2.5 | MPa |
| Strength test pressure | 1.5 | 2.4 | 3.8 | |
| Sealing test pressure | 1.1 | 1.76 | 2.8 | |
| Applicable Temperature | ≤80 | ℃ | ||
Standard requirements for external dimensions
1. The structural length of the valve shall comply with the standard of GB/T12221
2. Connecting flanges according to GB/T17241.6 standard

Outline Drawing:JM744X Piston-type Sludge Valve
Outline Dimension Table
| Nominal diameter | Key dimension | |||||
| H | L1 | L2 | D | D1 | z-φd | |
| 80 | 480 | 135 | 125 | 195 | 160 | 4-18 |
| 100 | 500 | 160 | 125 | 215 | 180 | 4-18 |
| 150 | 620 | 205 | 145 | 280 | 240 | 8-23 |
| 200 | 735 | 220 | 185 | 335 | 295 | 8-23 |
| 250 | 805 | 260 | 205 | 390 | 350 | 12-23 |
| 300 | 940 | 280 | 245 | 440 | 400 | 12-23 |
| 350 | 1100 | 305 | 270 | 500 | 460 | 16-23 |
| 400 | 1200 | 335 | 310 | 565 | 215 | 16-25 |

Model:
SD44X-10 / SD44X-16 / SD44X-10Q / SD44X-16Q / SD44X-25QSpecification:
DN80-DN300Pressure:
PN10~PN25Material:
Cast Iron, Ductile Iron
Model:
J744X-10 / J744X-16 / J744X-10Q / J744X-16Q / J744X-25Q / J744X-10P / J744X-16P / J744X-25PSpecification:
DN80-DN400Pressure:
PN10~PN25Material:
Cast iron, Ductile iron, Stainless steel
Model:
100S-10/100S-16/100S-10Q/100S-16QSpecification:
DN80-DN300Pressure:
PN10~PN16Material:
Cast Iron, Ductile Iron