Title:
PUMP INLET PRESSURE REDUCING VALVE
Document Type and Number:
Japanese Patent JP3686492
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent high pressure from being applied to a downstream side pump when pumps are connected in tandem and water is discharged.
SOLUTION: When a plurality of pumps is connected in tandem, an inlet pressure reducing valve 10 is connected to the inlet side of a downstream side pump, thereby, at the time of discharge work, pressure on the inlet side of the downstream pump can be retained to the same as the pressure of a first space 24, and high pressure is prevented from being applied to the downstream side pump. Also, when the downstream side pump and a discharge valve at the end of a drain hose are disconnected so as to stop discharge, a valve element 26 is seated on a valve seat 27, thereby pressure can be prevented from being applied from an upstream side pump to the downstream side pump, and a failure accident can be prevented, which is caused that abnormally high pressure is applied to the downstream side pump and the end of the discharge hose when discharge is stopped.
Inventors:
Kenji Yokoyama
Application Number:
JP2341397A
Publication Date:
August 24, 2005
Filing Date:
February 06, 1997
Export Citation:
Assignee:
Ishikawajima Shibaura Machinery Co., Ltd.
International Classes:
F04B49/08; F04B23/02; F04B23/04; F04B53/10; F16K17/02; G05D16/06; (IPC1-7): F04B53/10; F04B23/04; F16K17/02; G05D16/06
Domestic Patent References:
| JP49084730U | ||||
| JP2035207U | ||||
| JP62105510U | ||||
| JP62134979U | ||||
| JP6098197B2 |
Attorney, Agent or Firm:
Akira Kashiwagi
Shinji Kashiwagi
Shinji Kashiwagi
Previous Patent: WET TREATMENT OF PETROLEUM COMBUSTION ASH
Next Patent: FEEDBACK CONTROL METHOD AND DEVICE IN ATM EXCHANGE
Next Patent: FEEDBACK CONTROL METHOD AND DEVICE IN ATM EXCHANGE