Every ORBIT valve incorporates a proven tilt and turn operation that eliminates seal rubbing, which is the primary cause of valve failure. When an ORBIT valve is closed, the core is mechanically wedged tightly against the seat, assuring positive shut-off. When an ORBIT valve begins to open, the core tilts away from the seat and line flow passes uniformly around the core face. This eliminates the localized high velocity flow that typically creates uneven seat wear in ordinary ball, gate and plug valves. The core then rotates to the full open position.
The absence of seal rubbing during both opening and closing means easy, low torque valve operation and long term reliable performance. When valve leakage cannot be tolerated, the ORBIT operating principle can be relied upon to deliver a positive shut-off.
To close an ORBIT valve, as the handwheel is turned, the stem begins to lower.
Precision spiral grooves in the stem act against fixed guide pins, causing the stem and core to rotate.
Continued turning of the handwheel rotates the core and stem a full 90° without the core touching the seat.
Final turns of the handwheel mechanically wedge the stem down, pressing the core firmly against the seat.
ORBIT valves are manufactured in a variety of materials, sizes and trims to meet specific requirements.
Carbon steel, stainless steel, duplex SS, high nickel alloys and other special materials are used as service conditions require. Internal and external protective coatings are available for added durability in corrosive situations.
Soft or metal seated options are selected for the intended service. Because the seals in the valves do not rub and because they are mechanically compressed shut, they survive in high temperature and abrasive situations.
Hand or power operation can be selected. ORBIT builds double acting, spring close and spring open pneumatic actuators. User selected electric and hydraulic actuators are available. Extensive instrumentation choices are offered.
Handwheel extensions, safety interlocks, position indicator limit switches, thermal jackets, custom painting and special inspection can be provided.
Reference.. Schlumberger - Cameron