Patent · US Active

Discrete pilot stage valve arrangement with fail freeze mode

US9523376B2 · kind B2 · utility

0Cited by

21References

13Claims

0Family size

Assignee

ABB Schweiz AG · CH

Inventors

Jeroen Derkx · Enköping, SE
Arne Trangard · Västerås, SE
Mohammadali Honarpardaz · Hagfors, SE

Key dates

Filing date	Jul 18, 2013
Grant date	Dec 20, 2016
Priority date	—
Expiry date	Jul 18, 2033

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF15B2211/8623
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An on-off pilot stage valve arrangement for controlling at least one main stage valve. The on-off pilot stage valve arrangement includes a first pilot valve discretely operable between two states, an on and an off state, the first pilot valve having an input at which there is a first pressure and an output connected to the main stage valve, a second pilot valve discretely operable between two states, an on and an off state, the second pilot stage valve having an input at which there is a second pressure and an output connected to the main stage valve. Both the valves are configured to be set in one of the two states in case the arrangement loses power.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.