The Core Function and Troubleshooting of the Mud Pump Valve Box and Piston Assembly

2025-09-22 19:56:50

The Core Function and Troubleshooting of the Mud Pump Valve Box and Piston Assembly

1. Valve Box System

As the "heart valve" of the mud pump, the valve box fulfills the critical task of controlling the unidirectional flow of fluid. Commonly made of high-chromium alloy cast iron (Cr26), regular inspection is required:

Failure signs: Outlet pressure fluctuation >15%, honeycomb pitting on the valve seat sealing surface

Maintenance tips: Disassemble and clean every 200 operating hours. Use a special abrasive paste to repair scratches ≤0.5mm.

2. Piston assembly

Polyurethane composite pistons have a lifespan of approximately 400-600 hours. Abnormal wear symptoms include:

Piston rod eccentric wear (allowable value<0.1mm/m)

Cylinder liner inner wall scratches (depth >0.3mm requires replacement)

Typical case: A shale gas project increased piston life by 32% by installing a laser alignment tool.