Ball Valves

Ball valves open and close a line with a quarter turn of a ported ball, giving tight shut-off and low pressure drop for isolation duty. Seven Star LLC, an independent supplier in Muscat, supplies ball valves from Swagelok, Neles, Flowserve, Spirax Sarco, Bray International, Georg Fischer, EBRO and Weflo to oil and gas, process and utility customers in Oman and the GCC.

Types of ball valve in this category

Small-bore instrument ball valves such as the Swagelok 40, 40G, 60 and 83 series isolate gauges, transmitters and sample lines, with tube fitting, NPT or VCR ends. Three-piece valves like the Flowserve Worcester Series 44, Spirax Sarco M10S and EBRO V-3MH can be serviced in line. Floating ball valves suit small and medium sizes, while trunnion-mounted valves such as the Neles Series D and API 6D trunnion ball valves handle large sizes and high pressures in pipelines. Flanged full-port valves like the Bray Series F15/F30 and Weflo ductile iron valves serve water and general industry, and Georg Fischer thermoplastic ball valves handle corrosive chemicals.

How to select a ball valve

Define size, pressure class and end connection first. Then choose the body material for the fluid and temperature, and the seat: PTFE and reinforced PTFE for general service, PEEK for higher pressure and temperature, metal seats for abrasive or hot service. Decide on full or reduced port, floating or trunnion design, fire-safe and anti-static requirements for hydrocarbons, and whether the valve will be manual, gear operated or actuated, which sets the stem and mounting pad.

Data needed for a quotation

Send the full valve code, or size, pressure class, end connection, body and seat materials, fluid, temperature, operator and quantity.