Abstract: A three-valves manifold for a differential pressure type flow meter includes a valve unit and a housing. The valve unit includes a shaft portion, a first valve portion having a first through hole and first to third grooves and a second valve portion having a second through hole and fourth and fifth grooves. The housing includes a space in which the shaft portion and valve portions are rotatably arranged. The first and second through holes and first to fifth grooves are formed at positions such that the first and second through holes communicate differently with first and second inlet and outlet openings of the housing in each of first, second, and third rotational positions.

Abstract: A three-valves manifold for a differential pressure type flow meter including a valve unit 11 having a shaft portion 12, first valve portion 13a having first through hole 17a and first to third grooves 18a-18c and a second valve portion 13b having a second through hole 17b and fourth and fifth grooves 18d, 18e, and a housing 14 having a space 16 in which the shaft portion 12 and valve portions 13a, 13b are rotatably arranged, said first and second through holes and first to fifth grooves being formed at such positions that in a first rotational position, the first through hole 17a is communicated with first inlet and outlet openings 19a, 20a and the second through hole 17b is communicated with second inlet and outlet openings 19b, 20b; in a second rotational position, the first and second grooves 18a, 18b are communicated with the first inlet and outlet openings 19a, 20a, respectively and the fourth groove 18d is communicated with the second outlet opening 20b; and in a third rotational position, the third gr