Rising Stem Ball Valve
Rising Stem Ball Valve
※ Size Range: 2″-24″
※ Class Range: 150LB-2500LB
※ Fire Safe Design
※ Anti Static
※ Anti blow-out
※ Rising Stem Ball Valve Manufacturer
RSBV, or Rising Stem Ball Valve, is an acronym for this valve’s distinctive design, which includes features like its friction-free opening and shut-off processes. Performance is especially suited to unique specifications for various highly challenging working conditions, all-metal design and construction, fire resistant design, can conform to temperature ranges between -204°C or (-400°F) up to 815°C or (1500°F) working temperature, and also can accommodate to the impure medium (including sand, fibres) condition demands. It is also important to note that our designs completely adhere to the American Association of Corrosion Factory NACE standard criteria as well as the choice of materials satisfies the standards for sulphide stress cracking resistance.
With its self-cleaning capability, the RSBV may be used for long-distance pipeline scraping. When tilted away from the seat, the medium fluid is washed clean all along the sealing surface 360 degrees and removes any presence of foreign material. The rising stem ball valves are the perfect valve for zero leakage demands in harsher and tougher situations, RSBV vents gas emission, distribution, hydraulic pipeline, shut off, bypass, product segregation, pipeline emergency shut off, and higher operating speed.
What is a Rising Stem Ball Valve?
The special tilt-and-turn design by the rising stem ball valve manufacturer provides dependable performance while reducing seal friction. It is the technology of choice for difficult process circumstances, such as high temperature, critical isolation, and switching operations for adsorbents.
Rising stem ball valves are utilised all over the world in gas processing facilities that use molecular sieve systems for switching services because they are perfect for applications that desire minimal leakage and rapid operation.
Every rising stem ball valve features a tried-and-true tilt-and-turn mechanism that results in reduced seal friction, which is the main reason for valve failure. Seal rubbing is prevented during both valve opening and shutting, resulting in simple, low-torque valve operation and consistently dependable performance during its service life.
A rising stem ball valve’s core is mechanically trapped firmly against the seat once it is closed, resulting in a positive shutdown. The core shifts away from the seat as a valve opens, and line flow spreads evenly across the core face. This gets rid of the uneven seat wear that often occurs in a regular ball, gate, and plug valves due to localised high-velocity flow. After that, the core turns to its completely opened state.
Working: Rising Stem Ball Valve.
When the handwheel is turned clockwise starting from the open position, the stem will start to drop. The precise spiral grooves in the stem rub up against the fixed stem guide pin as it drops, turning the stem and core in a clockwise direction.
The stem stops rotating once the core has rotated 90 degrees and continues to descend linearly. The seat does not make touch the core when it is rotating.
The handwheel’s remaining rotations allow the stem to mechanically press the core against the seat, creating a tight seal by way of the cam arrangement at the stem’s bottom end.
Rising stem ball valve manufacturers carefully design these valves with several special components that work in harmony to deliver perfect sealing in order for them to function smoothly and for a longer period of time without any demand for maintenance. Below, we’ve attempted to outline a few of those elements.
- Valve Body: The body comes in several different corrosion resistant alloys and is generally made of carbon or stainless steel. It has been precisely developed for complete dependability and easy maintenance. The basic dimensions, including face-to-face and flange dimensions, meet all applicable API and ASME requirements. Except for Class 150, when it is oval, the body-to-bonnet flange is round. For Class 150 valves, the body-to-bonnet junction has a flat face, for Class 300, a male-and-female valve, and for Class 600 and higher, a ring joint. In essence, the body is outfitted with regenerative seats. For drain taps or bypass plumbing, there are bosses available. It is possible to thoroughly line or clad the interior surfaces that come into contact with the fluid to increase their resistance to corrosion or degradation.
- Bonnet: The bonnet is made of carbon or stainless steel and is offered in several various CRAs, identical to the body. It has a stuffing box that is designed in compliance with API standards and is machined to accommodate a yoke sleeve. On the bonnet surface, integrated lifting hooks could be placed.
- Seal: Rising stem ball valves are supplied with welded-in seat rings. a three-piece seat made up of a metal O-ring, an interior and an exterior ring. The rings are a component of the valve’s trim. They might be press-fit designed for simple replacement or externally threaded and internally notched for simple assembly and disassembly. The seating surfaces receive particular consideration and are lapped and ground for a tight seal. One simple illustration is a metal sealing valve seat. On request, non-metal sealing valve seats and bolted valve seats are available.
- Stem: The distinctive design of the stem is a development from the standard ball valve utilised by other manufacturers. A flat surface at the top of the helix is intended to wedge the ball against the seat. As a result, the valve is torque-seated, regardless of differential pressure, to provide a high level of tightness. When opened and closed, the RSBV stem moves very little axially. The stem is consistently in equilibrium. When opening and shutting, NO stem rotation happens in conjunction with axial movement, improving the performance in terms of material wear and fugitive emission. The travel is also adjusted to the bare minimum in order to fit smaller and minimize cycle time.
- Stem Guides: The symmetrically positioned valve stem guide slots and guide pins facilitate quick lifting and rotation of the rising stem ball valve stem by preventing imbalanced force during valve stem movement.
- Ball: The specific spherical closure revolves around the outside diameter of the stem and a lower trunnion. When opening and shutting, the ball never touches the seat. For the valve to effectively seal, it must only be in the fully closed position where it is jammed against the seat. When completely extended, the circular hole enables a hollow tube design for minimal pressure losses. The sitting surface of the ball can be hard-surfaced depending on any specific requirement.
Design Features: Rising Stem Ball Valve.
- Mechanical Closing: The valve core rotates around the trunnion centre and is positioned itself against the valve seat during the downward stroke of the valve stem, pushing the valve seat to create a tight seal. This is accomplished by the S-shaped guide rail and the wedge-shaped surface at the bottom of the valve stem. The valve stem threads maintain the position and exert positive downward force to guarantee that the valve core maintains a tight mechanical seal and won’t shift in response to variations in fluid pressure or flow direction.
- Self-Cleaning: When the stem of the valve is lifted, the valve core shifts slightly away from the valve seat, providing a little space that enables the medium to flow around the whole valve, washing the core and sealing the surface.
- Frictionless operation: The valve core will disengage from the seat before spinning thanks to the cam structure at the base of the valve stem. The valve core and valve seat are positioned relative to one another as illustrated in the picture, eliminating contact and friction between them. This prolongs the life of the valve core and valve seat and prevents degradation of the sealing surface brought on by friction. This eliminates the friction issue that conventional ball valves, gate valves, and butterfly valves may encounter at the seat during operation. The working torque of the valve can be decreased by removing friction between the valve core and the valve seat.
- Indicator: Rising stem ball valves also have a position indicator that displays the valve’s current position.
Technical Specification: Rising Stem Ball Valve.
- Design Standard : API 6D / ASME B16.34
- Face to Face Length : ASME B16.10 / API 6D
- Size Range : NPS 2” – NPS 24” (DN 50 – DN 600)
- Pressure Range : Class 150 – Class 2500 (PN 10 – PN 420)
- Temperature Range : -204°C – 815°C
- Material selection : A126 WCB / A352 LCC, A351 CF8/CF8M/CF3/CF3M, A995 4A
- End Connection : ASME B16.5 / ASME B16.47
- Test and Inspection : API 6D / API 598
Application: Rising Stem Ball Valve.
Rising stem ball valves could perform at a variety of temperatures and are utilised in applications where there must be no leakage. They are utilised in many applications, including those involving solvents, acids, natural gas, and other liquids of a similar kind, and they are engineered to be frictionless.
Natural gas applications frequently employ rising stem ball valves because of their capacity to tolerate high temperatures. In a range of sectors, including the pulp and paper industry and the oil and gas industry, rising stem ball valves are used to open and shut the flow of essential processes.
Summary: Rising Stem Ball Valve.
We provide a wide selection of rising stem ball valves, which are generally designed for petroleum refining. These valves can be used with adsorbents and dehydrating units in gas purification, isomerization units, and other processing facilities for high temperature and cycling operations.
As the sealing edges do not come into contact during rotation, rising stem ball valves are best suited for many of these demanding service applications that require the highest consistency. They also benefit from a long lifespan without being serviced. Our Rising Stem Ball Valve is unique because it provides tight sealing in both directions when the ball is in a close position to the single fixed seat. Rising Stem Ball Valves can be opened manually, electrically, pneumatically, or hydraulically.
The RSBV offers an unrivalled degree of robustness, dependability, and ease, regardless of your demands for molecular sieve switching, isomerization, combustion oil, high or low temperatures, or essential services. Oil and gas industry leaders depend on the RSBV for cost effectiveness, and minimal maintenance protection in the process and transmission of industrial fluids and gases.
Our goods are researched, assembled, and tested in line with all applicable industry standards and rules. We pressure test our rising stem ball valves to the highest standards. We also promote our ability to develop engineered valves, thus we encourage requests for unique size, class, and design specifications.