发明名称 |
FLOW CONTROL VALVE APPARATUS |
摘要 |
<p>A flow control valve apparatus includes a housing (5;) including a main fluid passage (4) having an inlet port (2) and an outlet port (3); a main valve (6;) disposed between the inlet port and the outlet port for allowing or shutting off communication between the inlet port and the outlet port; a backpressure chamber (11) formed between an inner wall of the housing (5;) and a rear portion (10) of a valve member (8;) of the main valve, the backpressure chamber communicating with the inlet port through an orifice (12); an auxiliary passage (13;) for placing the backpressure chamber in communication with the outlet port; and a pilot valve (14;) for actuating the main valve member by controlling the opening and closing of the auxiliary passage and varying the fluid pressure in the backpressure chamber. A differential pressure generating means (30;) is disposed in the main fluid passage (4) for generating differential pressures that correspond to the flow rate in the main fluid passage. The differential generating means (30;) includes a displacement member (32;) disposed for movement in the direction of fluid flow in the main fluid passage and spring means (33;) for urging the displacement member in the direction opposite to the direction of fluid flow, and the displacement member cooperates with a wall surface (34;) of the main fluid passage to define a fluid passage having an opening area which increases with an increase in the stroke of travel of the displacement member.</p> |
申请公布号 |
IN167170(B) |
申请公布日期 |
1990.09.15 |
申请号 |
IN1988CA38719 |
申请日期 |
1988.05.13 |
申请人 |
HITACHI CONSTRUCTION MACHINERY CO.,LTD. |
发明人 |
ICHIRYU KEN;KANAI TAKASHI;OCHIAI MASAMI;NOZAWA YUUSAKU;KATO HIDEYO |
分类号 |
F15B13/04;G05D7/03;G05D7/06;(IPC1-7):F16K21/00 |
主分类号 |
F15B13/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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