RISING STEM BALL VALVES Flowserve

Valbart RSBV Rising Stem Ball Valves are the oil and gas industry’s choice for applications requiring a mechanically energized metal or soft seat to prevent losses from process contamination or material leakage. They are ideal for frequent cycling.

The RSBV uses a unique helix system that opens and closes the valve without rotation. The linear only operation of the stem makes it an excellent choice for frequent cycling. Each linear operation, from opening to closing and back again, is a friction-free movement between seat and ball that significantly reduces valve wear and keeps routine maintenance to a bare minimum. The outside yoke and screw, with stuffing box-type gland packing, including gland and gland flange, eliminates the need for special tools when adjusting or repacking the stem seal. Top entry convenience allows visual inspection inside the valve without removing the valve from the pipeline. The stem also has a backseat to prevent possible blowouts and repacking stem seals under pressure when the valve is fully open. A special lapping technique applied to the Stellite6® ball and seat sealing areas allows for zero seat leakage. Heavy wall thickness provides extra corrosion allowance to reduce wear and extend the valve lifetime

Industries

General Industry
Chemicals
Water
Oil & Gas
Power
Basic (Organic & Inorganic)
Biofuels
Petrochemicals
Waste Water
Agriculture
Upstream Exploration & Production
Midstream Transportation
Downstream Processing
Conventional Steam

Standards

API 6D/API 6FA-607/FCI 70-2
NACE MR0175/API 598

Size Range

DN 25 to 600
NPS 1 to 24

Pressure Class Range

PN 10 to 320
Class 150 to 2500

Seating Material

Metal or soft

Features and Benefits

Extended service life and low maintenance costs due to unique helix coil stem design, which enables friction-free opening and closing
Improved product quality, efficiency, and safety with tightness performance up to ANSI FCI-70-2 Class VI
Easy in-line inspection and maintenance enabled by top-entry design
Reduced corrosion due to heavy wall thickness in excess to ASME/ANSI B16.34
Improved personnel safety from blowout-proof stem that meets international standards of API 600 and 6D

Other Features

Combination of a quarter-turn ball valve with a linear movement of non-rotating stem
Trunnion mounted design
Reduced or full bore
Single-seat (no valve body cavity)
Unidirectional or bidirectional
Metal to metal seat with stellite welding overlay (soft seat insert on request)
Outside screw and yoke for adjusting of stem packing
Blowout proof stem
Suitable for very high frequent cycling operations (switching valves)
Tight shut-off by means of application of external mechanical force and not dependent on differential pressure
Proper selection of materials to avoid galling and high friction
Protected lower trunnion against solid particles intrusion
Clearance control to consider high/low-temperature shrinkages
Self-cleaning closure member

Data Sheet

RISING STEM BALL VALVES Flowserve