Tee is right angle flow valve as fluid enters one side and goes on the other side and has three opening similar to what we buy Tee for plumbing from home depot. The name is same and function is almost the same but it is very high-pressure product pressure ranging from 2 k to 20 k psi. Flanges are connected to the 3 sides of the Tee.
Cross is same as Tee, except it has 4 sided openings and it is used when there are two wings of production trees. All 4 sides have different connections or flanges to connect with Gate Valves or Choke Valves etc. Both tee and crosses are connected in the center of the production tree.
Flanged crosses and tees can be made for 13.8 MPa, 20.7 MPa, 34.5 MPa, 69MPa, 103MPA and 138 MPa rated working pressure. Studded crosses and tees can be made for 13.8 MPa, 20.7 MPa, 34.5 MPa, 69.0 MPa, 103.5 MPA and 138 MPa rated working pressure.
The marking of the product is with ISO 10423 followed by Temperature class, Material class, Product specification level, Product requirement level, Nominal size, Thread size, End and outlet size connection, Rated working pressure, Ring gasket type and number, Date of Manufacture, Manufacturers name ( Reliable Valves), Serial No & Hardness test value.
When specific nominal sizes and combinations of nominal sizes do not appear in API Spec 6 A, Reliable Valves shall manufacture Studded/ Flanged Crosses and Tees according to the design criteria provided in API Spec 6A.