US 12,449,169 B2
Valve
Matthew Graham Legg, Swindon (GB)
Assigned to Dyson Technology Limited, Malmesbury (GB)
Appl. No. 18/038,419
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed Nov. 24, 2021, PCT No. PCT/GB2021/053052
§ 371(c)(1), (2) Date May 23, 2023,
PCT Pub. No. WO2022/123209, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 2019284 (GB), filed on Dec. 8, 2020.
Prior Publication US 2024/0093923 A1, Mar. 21, 2024
Int. Cl. F25B 41/26 (2021.01)
CPC F25B 41/26 (2021.01) [F25B 2313/0276 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A valve for a reversible heat pump system, the valve comprising:
six ports; and
three flow paths for a refrigerant, the three flow paths being selectable between different pairs of the six ports, wherein:
two of the three flow paths are non-restrictive flow paths; and
one of the three flow paths is a restrictive flow path,
wherein the restrictive flow path is arranged to cause expansion of the refrigerant,
wherein the amount of expansion of refrigerant caused by the restrictive flow path is variable as a function of the valve position, and
wherein the restrictive flow path is arranged to cause a linear change in the expansion of the refrigerant as a function of the valve position.