Check valves are automatically actuated. They are opened and sustained in the open position by the force of velocity pressure and closed by the force of gravity. Seating load and resultant tightness is dependent upon back pressure.

Delta Corporation

Delta Corporation is a leading US based oilfield engineering equipment design and manufacturing company specialized in the production of wellheads, X-mas trees and other oilfield equipment products.Delta provides a whole range of after sales services including installation, maintenance, re manufacturing and supply of space parts. Delta is the only existing company that has branches in the Middle East with full in-house capability to support regional and international extracting contractors and oil & gas producers to manage the complete pressure flow operations on site. Delta has proven to acquire a distinctive competence in performing customized wellheads and valves design and production. Field testing of equipment is guaranteed and carried out on premises through highly sophisticated and technological machines run by experienced engineers.