Abstract:
A valve assembly includes a valve housing (80) defining a service passage (94), a first bore (98) in fluid communication with the service passage, a first passage (120), a second bore (100) in communication with the service passage and a second passage (130). The first bore has an inlet portion (114), a first service portion (116) in communication with the service passage, and a first load holding portion (118). The first passage is in communication with the first load holding portion and the service passage. The second bore has a return portion (124), a second service portion (126) in fluid communication with the first service passage, and a second load holding portion (128). The second passage (130) is in selective communication with the second load holding portion of the second bore and the return passage. A valve is disposed in the second passage. The valve (132) allows fluid to flow only in a direction from the second load holding portion to the return passage.
Abstract:
A hydraulic control system includes a first motor, a second motor, a pump operatively associated with the first motor, a first coupling valve operatively associated with the second motor, first parallel valves operatively associated with the second motor, and a first switching valve operatively associated with the first coupling valve and the first parallel valves. The first switching valve is configured to switch the first coupling valve between a first coupling state and a second coupling state opposite the first coupling state and to switch the first parallel valves between a first parallel state and a second parallel state opposite the first parallel state. While the first parallel valves are in the first parallel state a portion of the output of the first motor drives the second motor while the first parallel valves are in the second parallel state, the output of the pump drives the second motor.
Abstract:
The present invention describes, generally, a method and system for controlling the dynamics of an actuatable load functioning or operable within a servo or servo-type system, wherein the dynamics of the load are controlled by way of a unique asymmetric pressure control valve (10) configured to provide intrinsic pressure regulation. The asymmetric pressure control valve (10), which may be referred to as a dynamic pressure regulator because of its capabilities, utilizes different sized free floating spools that are physically independent of one another and freely supported in interior cavities of respective corresponding different sized valving components that make up the valve body (12) to regulate the pressures acting within the overall system between the control or pilot pressure and the load or load pressure. The dual spools of the pressure control valve (10), although physically independent of one another, function in cooperation with one another in an attempt to maintain a state of equilibrium in the system, namely to keep pressure acting on or within the actuator (the load pressure), or the feedback pressure corresponding to the load pressure, the same as the control or pilot pressure. Moreover, pressure regulation and control is intrinsic to the asymmetric pressure control valve (10) because of the configuration and function of the dual spools and the feedback system acting on the spools, thus eliminating the need for electronically or mechanically user controlled systems.
Abstract:
Systems and methods for improved operation of hand tools are disclosed. Sensors may be configured to monitor one or more operational parameters of a hand tool and collected data may be communicated to the hand tool operator. The data may be compared to predetermined limits for an operational parameter to enable rea-time operational diagnostics adn quantative control. Data can be collected across a manufacturing facility and analyzed to help account for variations in technique and skill among operators. An understanding of relationships between monitored operational parameters can lead to improved consistency among finished products and reduction in manufacturing costs. Data may also be stored for future recall and analysis.
Abstract:
The invention pertains to a hygienic vacuum valve (10) for use in sterile environments such as food processing, medical and pharmaceutical applications where a vacuum valve is advantageously utilized in situ on processing equipment to eliminate multiple vacuum lines and valves remotely located from the processing equipment. The novel evacuation valve (10) is preferably pneumatically activated and used on machines requiring a sterile and hygienic evacuation and sealing operation as is common in the pharmaceutical, medical and food processing arts. The novel evacuation valve (10) provides a sterilized environment ans seals the package by having a housing (12) which accommodates a first piston for opening and closing a vacuum inlet ported to a vacuum outlet and a second piston disposed between the housing and the vacuum outlet for rapidly releasing the vacuum after the package has been sealed.
Abstract:
본 발명은 유압시스템의 설정 압력을 제한하는 릴리프밸브의 설정 압력을 유압시스템의 압력이나 조이스틱 조작에 의한 입력값에 따라 가변 조정할 수 있도록 한 것으로, 유압펌프와 유압 액츄에이터사이의 유로에 설치되며, 조이스틱 조작에 따른 제어신호에 의해 절환되어 유압 액츄에이터의 구동을 제어하는 유량제어밸브와, 유압펌프의 상류측 토출유로와 유압탱크사이의 유로에 설치되며, 시스템에 설정 압력을 초과하는 고 부하 발생시 작동유를 유압탱크로 리턴시키는 메인 릴리프밸브와, 메인 릴리프밸브의 설정 압력을 연속적으로 또는 단계별로 조절하는 압력 조절수단과, 유압펌프의 토출측 압력을 검출하는 압력 검출수단과, 조이스틱 조작에 의한 입력값과, 압력 검출수단에 의해 검출되는 시스템 압력에 따라 요구되는 릴리프밸브의 설정 압력을 결정하여, 결정된 설정 압력으로 릴리프밸브의 설정 압력을 가변 조정할 수 있도록 압력 조절수단에 제어신호를 출력하는 제어기를 구비한다.
Abstract:
The invention relates to a valve system (2, 3) comprising a housing (25), an actuator, a main valve (9.1, 9.2) disposed between an inlet chamber and an outlet chamber (18.1, 18.2), and a pilot chamber (26.1, 26.2). Said pilot chamber is linked with the outlet chamber (17.2) via a main valve (8.1, 8.2), comprising at least one pilot valve member (12.1, 12.2) and one valve body (12.1, 12.2) linked with the electromagnetic actuator (4.1, 4.2), and with the inlet chamber (17.1, 17.2) via at least one connecting channel (27.1, 27.2). The invention is characterized in that the stationary seat (11.1, 11.2) of the main valve (9.1, 9.2) is formed by an insert (31.1, 31.2) that is mounted in the housing of the valve system (2, 3). The main valve member (10.1, 10.2) is impinged upon on its diametrically opposed surfaces (32.1, 32.2, 33.1, 33.2) by the pressure present in the inlet chamber (17.1, 17.2) and the pressure present in the pilot chamber (26.1. 26.2). The pilot chamber (26.1, 26.2) is linked with the inlet chamber (17.1, 17.2) via a connecting channel (27.1, 27.2) that extends through the main valve member. The pilot valve member (12.1, 12.2) is formed by the insert (31.1, 31.2) mounted in the housing of the valve system (2, 3) or by the housing (25). The connection to the outlet chamber (18.1, 18.2) is made via at least one connecting channel (40.1, 40.2) disposed in the housing (25) or in the insert (31.1, 31.2).
Abstract:
The invention relates to a device for controlling flowing media, notably suction air, in conjunction with suction heads or such like. According to the invention closing elements made of an elastically deformable material, notably diaphragms (17, 18), are positioned in a valve housing (10) and via actuating lines (14, 15) are subjected (exclusively) to compressed air so as to move same into a closed or blocked position. When the diaphragm (17, 18) is moved into an open position a vacuum is generated on the side opposite the closing side.
Abstract:
A fluid flow valve having a body (11) with first, second and third fluid inlets (8, 18, 25), a working fluid outlet (4), a first pressure element (11) movable, under the influence of pilot pressure fluid applied to the first inlet, from a first position in which it causes closure of the second inlet, to a second position in which it causes opening of the second inlet, and a second pressure element (20) movable, in response to pressure at the fluid outlet, from a first position in which it causes closure of the third inlet (25) to a second position in which it causes opening of the third inlet, said elements (11, 20) operating in conjunction to permit an initial high volume fluid flow from the second inlet through the outlet and subsequently, with the second element causing interruption of a path between the second inlet and outlet, a high pressure fluid flow from the third inlet through the outlet. The invention embraces a vehicle braking system incorporating the aforesaid valve.
Abstract:
A pilot pressure operated directional control valve wherein a spool hole having a port is formed in a housing, a spool being slidably fitted in the spool hole such that it is caused to slide by means of a spring and by virtue of pilot pressure led into a pressure receiving chamber, the control valve being characterized in that a spring box is provided on an end surface of the housing as viewed in a longitudinal direction of the spool, and that the spring box has a void portion incorporating therein the spring and constituting the pressure receiving chamber and a pilot pressure intake port communicating with the void portion and made open in the longitudinal direction of the spool.