Jamesbury VPVL Series Jamesbury Valv-Powr VPVL series pneumatic actuator for fast, efficient and economical operation of rotary valves. Jamesbury VPVL Series Benefits N Modular design utilizing same body and end caps for both double-acting and spring-return versions N High cycle life with low friction bearings on all rotating and sliding surfaces N ISO 5211 mounting pattern N ATEX certified N Machined gear teeth provide longest life and smoother operation N Safety contained springs prevent hazards of inadvertent ejection during maintenance N Corrosion resistant with PTFE coated body, polyester coated end caps and stainless steel fasteners N Adjustable stops for both open and closed positions