Established in 2009, J-VALVES operates standardized industrial valve manufacturing workshops capable of bulk production of 10×8 inch 300LB A105N pneumatic trunnion mounted ball valves. The plant is split into dedicated CNC machining zones, pressure testing bays, pneumatic actuator assembly lines and dust-proof finished product storage areas. Layered quality checkpoints cover the whole manufacturing cycle from steel forging, actuator assembly down to final leakage re-inspection. Rigid in-factory quality assurance drives high client repurchase rates across our oilfield and chemical sector project portfolio.
1. Forging & Precision CNC Machining Builds Pressure-resistant Valve Shells
Solid A105N carbon steel bar stock is closed-die forged into monolithic valve body blanks, removing structural failure risks associated with welded split valve body seams. Forged blanks undergo natural stress relief treatment before CNC machining operations including flange face boring, flow channel polishing and precision seating groove milling. Custom programmed machining caters to non-standard 10×8 reducing dimensions, controlling bolt hole concentricity and internal flow path surface finish to mitigate abrasive media turbulence erosion. Every machined blank receives ultrasonic non-destructive testing. Units with internal micro-cracks and inclusion defects get scrapped and isolated from downstream assembly workflows.
2. Ball & Seat Pre-installation Blocks Internal Seating Leakage
Precision polished stainless steel balls pair with PTFE or metal hard-faced seats selected based on process media characteristics: filled reinforced PTFE sealing suits general crude oil and natural gas service, while Stellite alloy overlay hard facing is deployed for abrasive particle-laden process fluid. Dial gauge alignment calibrates ball rotational concentricity to eliminate operating jamming and static seat leakage. Pre-installed assemblies go through preliminary low-pressure air tightness screening to catch assembly alignment defects ahead of final assembly.
3. Scotch Yoke Pneumatic Actuator Assembly & Functional Cycle Testing
Workshop fitting stations assemble internal actuator pistons, fail-safe return springs and guide sealing packs. Outdoor-grade anti-corrosion coating is applied to exterior red cylinder housings. Precision keyed shaft locking connects actuator power output to valve stem, followed by installation of air pressure regulators, limit position feedback sensors and explosion-proof solenoid valves. Completed valve assemblies connect to workshop compressed air supply networks for 300 consecutive full-stroke endurance cycling, validating breakout torque reserve, switching reaction speed and spring-assisted fail-safe performance while pinpointing micro air line leakage spots.
4. API Standard Pressure Testing And Project-ready Packaging
Per API 6D requirements, finished assemblies pass shell hydrostatic testing at 1.5 times rated Class 300 pressure rating plus seat bubble-tight air tightness hold testing pressurized at 1.1 times nominal working pressure. Pressure qualified valves receive surface cleaning, plastic flange dust cap fitting and categorized placement inside temperature-controlled dust-proof warehouses. Project palletized packaging prevents sealing face impact damage during cross-regional logistics transit.
