一、Overview and Working Principle
The JWT-DL Screw Top-Pressure Valve Test Bench is a specialized equipment independently developed by our company, leveraging years of expertise in valve test bench design. It serves as a dedicated solution for pipeline ball valve inspection while also being widely applicable for performance testing of various high-, medium-, and low-pressure valves with flanged, welded, or threaded connections. With its comprehensive functionality, user-friendly operation, and stable reliability, this equipment significantly enhances production efficiency and reduces labor intensity, making it an indispensable choice for valve manufacturers, users, and maintenance enterprises.
二、System Composition
The JWT-DL test bench comprises three core systems:
Mechanical System
Electrical System
Piping System
The equipment features both split-type (separate host and water tank) and integrated-type configurations.
Key Innovations and Operation
1. Lead Screw Assembly Mechanism
Solves the challenge of horizontal transmission for large-scale lead screw assemblies.
Precision Force Control : Top pressure is regulated by adjusting the exciting current in the tension controller (factory preset).
Automatic Overload Protection : Halts operation upon reaching preset force, preventing valve damage.
2. Structural Configuration
Right Frame : Houses the nut assembly mounted on roller bearings within the frame aperture, enabling smooth rotation.
Central Frame : Equipped with a fixed blind flange and a specialized support system for the lead screw, effectively counteracting excessive friction caused by screw weight.
Movable Frame : Integrated with the lead screw and traverses along dual guide rods.
3. Intelligent Motion Control
Translation Mechanism : Driven by a motor via clutch, gear reducer, and gear train engaging the lead screw assembly.
Three-Stage Movement :
Rapid Advance : For swift valve positioning.
Controlled Final Seating : Slow advance for precise alignment.
Retraction Sequence : Initial slow withdrawal followed by automatic switch to rapid retraction after a time relay delay (seconds).
4. Dual-Media Testing (Water/Gas)
Conducts Shell Test and Seal Test on valves.
Post-Test Drainage : Utilizes compressed air to evacuate residual water from the valve cavity (customer-provided compressor).
Flexible Pressurization : Pressure medium (water/gas) can be injected or released through ports on either blind flange.
5. Hydraulic Pressure System
Dual-Pump Architecture :
High-Flow Low-Pressure Pump : Rapidly fills valve with test medium.
Low-Flow High-Pressure Pump (Air-Driven) : Delivers precise high-pressure water.
Automated Testing Sequence :
Low-pressure pump fills valve.
High-pressure pump pressurizes to preset value and auto-stops.
System enters timed pressure-holding phase (user-defined duration).
Audible/visual alarm signals test completion.
Note: Critical settings (e.g., exciting current for force control) are factory-calibrated to ensure optimal performance and safety.