Rising Stem Ball Valves
Rising Stem Ball Valves
Ideal for applications that require zero leakage and frequent operation, ORBIT rising stem ball valves are used globally in critical isolation applications.
ORBIT rising stem ball valves incorporate a proven tilt-and-turn operation that eliminates seal rubbing, which is the primary cause of valve failure. The absence of seal rubbing during both opening and closing means easy, low-torque valve operation and long-term reliable performance.
When an ORBIT rising stem ball valve is closed, the core is mechanically wedged tightly against the seat, ensuring positive shutoff. When a 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 fully open position.
ORBIT Actuation and Instrumentation
QRC provides tailored packages that include valves, actuators, and instrumentation. Our actuation and instrumentation services for ORBIT rising stem ball valves provide reliable, trouble-free on-off operation and are especially suitable for simple or extensive instrumentation.
ORBIT rising stem ball valves can be equipped with matched valve linear actuators, and many capabilities can be added to the basic double-acting actuator. Models are available with a spring-return option to open or close. Manual override mechanisms also are available.
A variety of instrumentation capabilities can be provided to meet a variety of your system’s needs. Many common systems are available as economical standard packages. Pneumatically or electrically activated systems also are available.
Special Features & Enhancements
FE type testing results
- High-temperature packing: ISO FE AH—CO2—SSA 0—t (RT, 400 degC)—CL2500—ISO15848-1
- Low-temperature packing: ISO FE AH—CO3—SSA 3—t (RT, –50 degC)—CL2500—ISO15848-1.
- No rub between sealing surfaces
- Injectable packing
- Single-seat design
- Long life
- Optimal flow: full port or reduced port openings give high CV figures
- Top-entry design
- Dual stem guides
- Low-torque operation
- Wear-resistant hard facing on core
- Mechanical cam closure
Specifications & Compliances
- API 6D
- ISO 9001:2008
- PED 97/23/EC
- ATEX Directive 94/9/EC
- GOST-R certificate and RTN permit
- ISO 15848-1 (fugitive-emission-type testing)
- Shell GSI SPE 77/300 TAT qualified and TAMAP two-star rating
- ASME B16.34