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Three-way and four-way multiport ball valves in L-port and T-port patterns for diverting, mixing, sampling and changeover duty, DN15 to DN300, in stainless and carbon steel.
A multiport ball valve has a ball drilled with an L, T or more complex passage so that one quarter or half turn redirects flow between three or four pipe connections. It replaces a tee and two isolation valves with a single body, giving faster changeover, no possibility of opening the wrong valve, and a smaller installed footprint. L-port three-way valves divert a common inlet to one of two outlets with positive shut-off of the unused path. T-port valves can combine, split or run straight through, at the cost of not sealing all paths at once. Four-way patterns serve flow reversal and dual-filter changeover. Common duties include tank selection, pump and strainer changeover, sampling, blending and header distribution. Indian manufacturers typically offer these in CF8M and CF8 stainless and WCB carbon steel with PTFE or reinforced PTFE seats, screwed, flanged or weld ends, and lever, gear or actuated operation with adjustable stops. Bodies are rated per ASME B16.34 and tested to API 598 against the agreed port combinations. In an enquiry state the port pattern, a simple flow matrix of which paths must be open or closed in each position, size, rating, materials, ends and operation.
A multiport ball valve does the work of a pipe tee plus two or three isolation valves: one quarter or half turn selects the flow path, changeover is immediate, and the wrong-valve-open error disappears because the geometry only permits the drilled paths. Typical duties are tank and header selection, duty-standby pump and strainer changeover, sampling, blending and simple flow reversal.
The ball passage turns through 90 degrees, connecting the common port to one of two others. The unused leg is shut against a seat, so an L-port both routes and isolates. With 180 degree operation an all-closed intermediate position is available in many designs. This is the pattern for tank filling and duty-standby selection.
The passage is a tee, so the valve can run straight through, divert to a branch, or connect all three ports for mixing. Because one path is always open, a T-port never dead-heads a running pump, which is exactly why it is chosen for changeover on live systems, but it must not be used where every port needs simultaneous isolation.
Four-port bodies serve flow reversal and dual-filter changeover; manufacturers also drill custom patterns for sampling and metering skids. These are engineered items, so send the flow matrix early.
Seat count decides behaviour. Two-seat designs seal the closed leg of an L-port well but leave the body cavity in communication with some ports. Four-seat designs isolate the cavity and improve shut-off across positions at higher torque and cost. During transition the ports can be momentarily interconnected or momentarily all closed, and which of the two happens matters for contamination-sensitive and pump-protection duties, so raise it explicitly.
Most multiport valves are floating-ball designs in CF8M, CF8 or WCB with PTFE or reinforced PTFE seats; large or high-class requirements move to trunnion-style engineered valves. Ends are screwed, flanged to ASME B16.5, or weld; bodies are rated per ASME B16.34 with testing to API 598 against the agreed port combinations, and fire-safe construction to API 607 or ISO 10497 can be specified for flammable media.
Specify rotation, 90 or 180 degrees, stop positions, handle orientation logic and locking; for automation state whether a two-position actuator with stops or a multi-position unit is intended, and ask for a position indicator matched to the port pattern.
Size, rating, pattern with a position-versus-ports flow matrix, common port location, which paths must be bubble-tight and at what differential, materials, seat type, ends, medium and temperature, operation, quantity, and inspection requirements. Indian manufacturers supply these patterns for export routinely once the flow matrix is fixed.
A multiport valve is an ordinary ball valve with a differently drilled ball. An L-port ball has a single passage turned through 90 degrees; a T-port ball has three openings meeting at the centre; four-way balls carry two separate passages or a cross. The body provides three or four seat bores at 90 degree spacing, and rotating the ball maps its internal passage onto different combinations of those bores. Everything else — stem, seats, packing — behaves as in a two-way valve.
With the common port at the bottom or side, a 90 degree turn swings the passage from the left outlet to the right one. The leg not in use faces solid ball surface backed by a seat, so it is positively closed. Turned to an intermediate 90 degree station in a 180 degree design, both outlets can face solid ball and the valve is fully shut. This makes the L-port a selector and an isolator in one.
The tee passage can bridge any two adjacent ports or all three at once. That gives straight-through flow, divert-to-branch, or full mixing, but there is no rotation at which all ports see solid ball; a T-port valve is a router, not an isolator, and specifications that assume it will block everything are the most common source of disappointment with this product.
As the ball rotates between stations, edges of the passage sweep across the seat bores. Depending on drilling, ports are either momentarily interconnected, which can cross-contaminate two products or briefly backfeed a header, or momentarily all restricted, which can dead-head a running pump for a fraction of a second. On slow gear or actuated operation that fraction becomes seconds. Which behaviour the drilling gives, and whether it is acceptable, should be checked against the process rather than discovered at commissioning.
Most multiport valves are floating designs, so seat loading changes with which port is pressurised: the ball is pushed off the pressurised port onto the seats opposite. In two-seat designs some positions leave the cavity and an idle port in communication, so residual product can sit in the cavity and re-enter the stream on changeover. Four-seat designs close the cavity off at each bore, improving hygiene and shut-off at the price of roughly doubled seat friction.
With more seats engaged and a larger wetted seat area, breakaway torque runs higher than a two-way valve of the same size, and the seat at the common port sees flow in every position, so it wears first. Frequent changeover duty justifies reinforced seats.
The recurring ones are stops set to the wrong quadrant so the valve routes flow incorrectly while the handle looks right, seat wear at the common port, trapped product in the cavity, and T-ports installed where isolation was needed. All four are avoided at specification time: fix the flow matrix, mark the positions on the valve, and state the sealing duty per position in the enquiry.
Padamade Private Limited
