VTH Series Declutchable Manual Gear Override
VTH series declutchable gear override adopts new type of worm gear and vortex rod drive mechanism, integrating the latest technology and material of declutchable
gear override, based on extensive experience of field installation and product application, mainly dedicated to opening 90°stroke switch valves such as ball valve,
plug valve, butterfly valve, and assisting pneumatic and electric actuators to guarantee opening and closing safely. It has been fully approved by practice the series
features following advantages:
- High performance and high reliability
- Fully compliant with the latest international standards and regulations
- More applicable to a wide range of specifications and higher cost performance
- Compact design is better suited for a variety of industrial applications
Structure:
- Integrate and compact design which is rational with miniature size, light weight, large output torque, and labor saving.
- The connecting flange and connecting shaft diameter on the top and the bottom are conform to the latest international standard ISO5211 which is a convenient interface with valve and actuator presenting superior interchangeability for installation and replacement.
- The self-locking design of worm gear contributes to the strengths like convenience, security, and reliability in operation process.
- Dual independent travel stoppers can conveniently and precisely implement ±10° adjustments externally in two directions, allowing the series in alignment with valve on both the opening and closing phases of the stroke.
- The series are specially factory lubricated with regard to the worm gear to improve the operational reliability, lubricity, and service life.
- The integrate anti-off design of the output shaft highly prioritized security. The fracture resistance and service life are optimized for nickel plating treatment.
- Superior performance of dust-proof and water-proof due to sealing rings applied at the interface between upper and lower housings as well as the interface between output shaft and housing to guarantee the leakproofness, dust-proof and water-proof of the series.
- Corrosion resistance technology is adopted with respect to the interior and exterior housing at the top and the bottom. Fine ground shaft hole surface lead to low friction coefficient and high cycle life.
- The series realizes free switch between manual and pneumatic operation that lift the limit pin and rotate the handle to lower right to automatic limit position to achieve automatic operation, and achieve manual operation conversely.
- Surface treatment is optional with paint spraying or epoxy resin with different color options as per customers’ requirements.
- Working Temperature:
- Low Temperature Type: -40℃~80℃
- Standard Temperature Type: -20℃~80℃
- High Temperature Type: -15℃~150℃
