US 11,852,260 B2
Time delay valve and flow rate controller
Akiho Nishimura, Tsukubamirai (JP); and Akira Tadano, Tsukubamirai (JP)
Assigned to SMC CORPORATION, Chiyoda-ku (JP)
Appl. No. 18/000,659
Filed by SMC CORPORATION, Chiyoda-ku (JP)
PCT Filed Sep. 30, 2020, PCT No. PCT/JP2020/037157
§ 371(c)(1), (2) Date Dec. 2, 2022,
PCT Pub. No. WO2021/245957, PCT Pub. Date Dec. 9, 2021.
Claims priority of application No. 2020-097348 (JP), filed on Jun. 4, 2020.
Prior Publication US 2023/0213113 A1, Jul. 6, 2023
Int. Cl. F16K 31/36 (2006.01); G05D 7/01 (2006.01); F16K 31/363 (2006.01)
CPC F16K 31/363 (2013.01) [G05D 7/014 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A time delay valve comprising:
a switching valve configured to be switched between a first position and a second position;
a first flow path configured to allow communication at the first position of the switching valve;
a second flow path configured to allow communication at the second position of the switching valve; and
a first throttle valve provided in at least one of the first flow path or the second flow path;
a biasing member configured to bias the switching valve toward the first position;
a drive mechanism configured to bias the switching valve toward the second position under an action of a supply pressure of a pilot fluid;
a pilot flow path configured to guide the pilot fluid to the drive mechanism; and
a delay mechanism configured to delay switching timing of the switching valve,
wherein the delay mechanism includes:
a delay throttle valve provided in the pilot flow path; and
a compensation mechanism configured to bias the switching valve toward the first position prior to biasing by the drive mechanism under an action of the supply pressure of the pilot fluid, and
wherein the compensation mechanism is driven by a part of the pilot fluid flowing thereinto through a compensation flow path branched from the pilot flow path, and compensates a biasing force when the drive mechanism displaces the switching valve, in accordance with fluctuation in the supply pressure of the pilot fluid.