EP0097246A2 - Ventilvorrichtung zum langsam unter Druck bringen von pneumatischen Systemen - Google Patents

Ventilvorrichtung zum langsam unter Druck bringen von pneumatischen Systemen Download PDF

Info

Publication number
EP0097246A2
EP0097246A2 EP83104924A EP83104924A EP0097246A2 EP 0097246 A2 EP0097246 A2 EP 0097246A2 EP 83104924 A EP83104924 A EP 83104924A EP 83104924 A EP83104924 A EP 83104924A EP 0097246 A2 EP0097246 A2 EP 0097246A2
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
spool
chamber
reducing valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83104924A
Other languages
English (en)
French (fr)
Other versions
EP0097246A3 (de
Inventor
Luciano Migliori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0097246A2 publication Critical patent/EP0097246A2/de
Publication of EP0097246A3 publication Critical patent/EP0097246A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/068—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with valves for gradually putting pneumatic systems under pressure

Definitions

  • This invention refers to a valve device for gradually and automatically putting under pressure pneumatic systems and equipment, such as systems for controlling pneumatically-operated large presses, pneumatic actuators and power-consuming machines in general, and for gradually putting under pressure the chamber of pneumatic cylinders.
  • a scope of this invention is to provide a valve device, for the described purposes, which is unaffected by pressure peaks which may occur during operation, thus avoiding unnecessary repairs or stoppage of the machine under still acceptable operating conditions, and intervening only when the pressure of the fluid fed to the pneumatic circuit drops below a pre-established value, usually below the value of the initial limited feeding pressure.
  • a further scope of this invention is to provide a valve-device by which it is possible to slowly put the system under pressure, at a limited or lower pressure than the normal working pressure of the system, thanks to the use of a pressure-reducing valve which is automatically piloted by the pressure within the pneumatic system, this piloting being achieved by means of a differential control of the pressure upstream and, respectively, downstream from the reducing valve.
  • a still further scope of this invention is to provide a valve-device for the described purposes, which is simple in construction, compact and also embodies a single-acting rapid exhaust valve, which operates automatically in order to allow the reverse flow of the air under pressure, from the inlet to the outlet of the valve-device itself.
  • a still further scope of this invention is to provide a valve-device for gradually and progressively starting up pneumatic systems, which is of universal use, namely that it can be used in systems and machines of different types, due to the fact that it is provided with a device for adjusting the pressure-reducing valve.
  • valve-device comprising a valve casing having an inlet and an outlet port connected by means of a pressure-reducing valve, said reducing valve comprising a poppet member, also referred to as "poppet" mounted on a spool axially movable from a completely open to a partially closed position of the reducing valve; a first chamber to one side of the poppet, communicating with the fluid inlet, and a second chamber on the opposite side of the poppet, communicating with the fluid outlet, and a balancing spring acting upon the poppet to push it towards a valve seat, in the second position of the supporting spool; the device comprising moreover, pneumatic pilot means for piloting the reducing valve, comprising a front piston and, respectively, a back piston connected to the aforesaid spool, said front piston being movable within a third chamber communicating with the fluid inlet, said back piston being, in turn, movable within a fourth chamber communicating with the fluid outlet
  • the valve-device comprises a casing 1 provided with an inlet port 2 for the fluid under pressure, and an outlet port 3 situated on the opposite side, and in a different plane to the inlet port 2.
  • the fluid inlet 2 is in communication with the outlet 3 through an internal passage comprising a pressure-piloted reducing valve.
  • a tubular extension or sleeve 4 spaced apart from the inner surface of the casing and defining, together with the latter, an annular chamber the purpose of which will be described in detail further on.
  • the tubular extension or sleeve 4 presents radial apertures 5 through which the inlet 2 communicates with an internal chamber 6, hereinafter referred to as first chamber, and respectively, with another internal chamber 7, coaxial to and above the first, referred to as third chamber.
  • the end of the sleeve 4 inside the valve casing 1, defines an annular valve seat 8 towards which is pushed a flow control member or poppet 9 fixed to the shank of a spool 10, said spool 10 being able to slide axially in the sleeve 4, from a forward or fully open position of the pressure-reducing valve 8,9, to a backward or partially closed position of the aforesaid reducing valve. Consequently, the poppet 9 of the reducing valve is movable within a chamber 11, referred to as second chamber, communicating directly with the outlet 3 of the valve-device.
  • a biasing spring 12 acts upon the poppet to push it towards the valve seat 8 or second condition of the spool 10; said biasing spring 12 is housed in a lower extension of the second chamber and rests directly between the disc 9A of the poppet and a plug 13 on the bottom of the chamber 11, possibly provided with a connecting aperture for a pressure switch.
  • the device comprises moreover, pilot means for piloting the reducing valve, capable of opening said reducing valve rapidly whenever a pressure equal to a pre-established percentage of the working pressure of the system is reached downstream from the reducing valve.
  • the reducing valve piloting device is based on the principle of sensing a pressure difference between the pressure upstream and the pressure downstream from the reducing valve, and of rapidly opening the valve whenever this difference is balanced or has merely changed the sense.
  • the spool 10 supporting the plug or poppet 9 is connected to a pair of opposing pistons upon which different pressures are exerted; in particular, the pilot means comprises a first or front piston 14 consisting of a portion having a greater diameter than the spool 10, provided with a lip seal 15 which slides in contact with the internal wall of the chamber 7 having a greater diameter and opening out on the chamber 6, upstream from the reducing valve.
  • a second piston in the form of a sleeve 17, acting in the opposite way to the first one and therefore referred to as back piston, consists of a sleeve tightly sliding on a neck portion 18 of the spool 10; here too, the second piston 17 is provided with a lip seal 19 tightly sliding in a fourth chamber 20 situated at the opposite end of the described valve casing 1.
  • the sleeve 17 of the second piston is movable with regard to the spool 10, and presents an annular flange 21 which stops against an annular ledge surface 22 on the internal wall of the casing 1.
  • the chamber 20 of the back piston 17 is in connection with the pressure upstream from the reducing valve; consequently, in the embodiment shown, the spool 10 presents an axial duct 23, of limited diameter, which opens out, on one side, into the chamber 20 of the back piston, whereas, on the other side, it opens out on the chamber 11 situated downstream from the valve 8,9, through a passage in the supporting plate of the poppet.
  • the described valve-device moreover comprises an adjustable stop member against which the spool 10 comes to rest, in order to prevent the reducing valve 8,9 from closing completely.
  • This stop member is in the form of a threaded dowel 24 which is screwed tight into an extension 25 of the casing 1; the internal end of the threaded dowel 24 comprises a flat head 26 against which the end of the' spool 10 comes to rest. Adjusting the position of the stop dowel 24, consequently adjusts the position of the poppet of the reducing valve and, therefore, the value of the reduced pressure fed through the outlet 3 of the device, to a system or power-consuming machine.
  • the device is completed by a single-acting or rapid-exhaust valve, for connecting the outlet 3 and the inlet 2 of the device, by-passing the reducing valve 8,9, whenever the pneumatic system must be exhausted or turned off at the end of a daily work cycle.
  • a single-acting or rapid-exhaust valve for connecting the outlet 3 and the inlet 2 of the device, by-passing the reducing valve 8,9, whenever the pneumatic system must be exhausted or turned off at the end of a daily work cycle.
  • the annular seal 27 is subjected to the pressure of the incoming fluid existing in the annular chamber 29 which surrounds the sleeve 4 and which communicates with the chambers 6 and 7 through the passages 5 in the sleeve itself; the aforesaid seal 27 is consequently pushed shut against an annular seat 30 inside the casing 1, by the pressure of the incoming fluid itself, and is raised and opened by the downstream pressure, whenever the feeding of the pneumatic fluid is interrupted and the system is exhausted.
  • the device operates as follows: from the side of the first chamber 6 of the poppet, the compressed air or pneumatic fluid is fed in at a first pressure value P1, whereas the internal diameter of the chamber 6, apart from negligible differences, corresponds with the diameter of the internal surface of the poppet 9 sealing against the seat 8; the external diameter of the poppet 9, on the side of the chamber 11 situated downstream from the pressure-reducing valve is greater than the internal diameter of chamber 6. Moreover, the diameter of the piston 14 is greater than that of the previous chambers, and the diameter of the back piston 17 or of the relative chamber 20, is greater than the diameter of the front piston.
  • stop dowel 24 for the spool supporting the poppet is situated in a position so that the reducing valve 8,9 allows the fluid to flow through with a maximum pressure drop equivalent to 30% of the working pressure P1 fed in at the inlet 2 of the valve-device; in other words, it is assumed that the maximum downstream pressure provided by the reducing valve is P2 - 70% 91.
  • valve-device which will continue to remain open, even if the value of the inlet pressure should accidentally drop below its rated value P1, to the reducing valve-operating value P2.
  • the rapid-exhausting valve 27 will only open when the inlet pressure drops substantially below the pressure P2, for example, when exhausting the system upstream from the above-described valve-device, due to the lack of pressure P1, whilst the pressure-reducing valve will close, that is to say, it will return to its initial operating condition without, consequently, affecting the exhausting of the pneumatic fluid.
  • a signal is sometimes requested to indicate that the system or machine is working at full pressure, or for carrying out other tasks.
  • This signal can easily be obtained by providing a contact or switch 31 operated by a tongue 32 screwed onto the lower end of the spool 10, as shewn in the modified embodiment of figure 2, in which the same numerical references indicate parts corresponding to the example of figure 1.
  • the tongue 32 is screwed or otherwise secured to the spool 10, without closing the channel 23, and slides through a sealing device provided at the end of the casing 1, as shown.
  • the valve of figure 2 is constructed in the same way and operates identically to'the valve of fig. 1; hence, the same device, without any substantial modifications, carries out two distinct or correlated functions, acting both as a device for gradually putting pneumatic systems under pressure, and as a pressure switch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Fluid Pressure (AREA)
  • Fluid-Pressure Circuits (AREA)
EP83104924A 1982-06-07 1983-05-19 Ventilvorrichtung zum langsam unter Druck bringen von pneumatischen Systemen Withdrawn EP0097246A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2173482 1982-06-07
IT21734/82A IT1151291B (it) 1982-06-07 1982-06-07 Dispositivo valvolare per la messa in pressione graduale di impianti pneumatici

Publications (2)

Publication Number Publication Date
EP0097246A2 true EP0097246A2 (de) 1984-01-04
EP0097246A3 EP0097246A3 (de) 1984-09-26

Family

ID=11186110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104924A Withdrawn EP0097246A3 (de) 1982-06-07 1983-05-19 Ventilvorrichtung zum langsam unter Druck bringen von pneumatischen Systemen

Country Status (2)

Country Link
EP (1) EP0097246A3 (de)
IT (1) IT1151291B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561798A1 (fr) * 1984-03-23 1985-09-27 Levenez Yves Detendeur a mise sous pression progressive
FR2582749A1 (fr) * 1985-05-31 1986-12-05 Levenez Yves Raccord-demarreur pour la mise en pression progressive des installations pneumatiques
EP0508271A1 (de) * 1991-04-09 1992-10-14 Smc Kabushiki Kaisha Sanftanlaufventil
EP0730097A2 (de) * 1995-02-28 1996-09-04 Press Controls AG Rümlang Startventil
EP0845601A1 (de) * 1996-12-02 1998-06-03 Press Controls AG Rümlang Startventil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107143543B (zh) * 2017-04-27 2018-11-09 武汉船用机械有限责任公司 一种液压控制阀组及控制阀

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304404A (en) * 1941-05-22 1942-12-08 Howard V Flanagan Automatic pressure loss cutoff valve
CH355001A (fr) * 1959-07-09 1961-06-15 Gossiaux Willy Vanne
FR1560382A (de) * 1967-12-22 1969-03-21
FR1580794A (de) * 1967-09-26 1969-09-05
US3631894A (en) * 1969-09-19 1972-01-04 White Sales Corp Graham Air start valve
US3792714A (en) * 1972-05-04 1974-02-19 W Miller Safety valve structure
FR2273180A1 (de) * 1974-05-31 1975-12-26 Ross Operating Valve Co

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304404A (en) * 1941-05-22 1942-12-08 Howard V Flanagan Automatic pressure loss cutoff valve
CH355001A (fr) * 1959-07-09 1961-06-15 Gossiaux Willy Vanne
FR1580794A (de) * 1967-09-26 1969-09-05
FR1560382A (de) * 1967-12-22 1969-03-21
US3631894A (en) * 1969-09-19 1972-01-04 White Sales Corp Graham Air start valve
US3792714A (en) * 1972-05-04 1974-02-19 W Miller Safety valve structure
FR2273180A1 (de) * 1974-05-31 1975-12-26 Ross Operating Valve Co

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561798A1 (fr) * 1984-03-23 1985-09-27 Levenez Yves Detendeur a mise sous pression progressive
FR2582749A1 (fr) * 1985-05-31 1986-12-05 Levenez Yves Raccord-demarreur pour la mise en pression progressive des installations pneumatiques
EP0508271A1 (de) * 1991-04-09 1992-10-14 Smc Kabushiki Kaisha Sanftanlaufventil
US5381828A (en) * 1991-04-09 1995-01-17 Smc Kabushiki Kaisha Slow starting valve
EP0730097A2 (de) * 1995-02-28 1996-09-04 Press Controls AG Rümlang Startventil
EP0730097A3 (de) * 1995-02-28 1998-07-29 Press Controls AG Rümlang Startventil
EP0845601A1 (de) * 1996-12-02 1998-06-03 Press Controls AG Rümlang Startventil

Also Published As

Publication number Publication date
IT8221734A0 (it) 1982-06-07
EP0097246A3 (de) 1984-09-26
IT1151291B (it) 1986-12-17

Similar Documents

Publication Publication Date Title
US4340086A (en) Hydraulic control valve unit
US9222490B2 (en) Pilot-operated quick exhaust valve
US4491154A (en) Double acting pilot valve
US3967849A (en) Vacuum control system
GB2459720A (en) Fluid flow control device, eg for a remote pipeline valve positioning system
US2610819A (en) Automatic stop and vent valve
EP2236840B1 (de) Verstärkungsventil
US4303091A (en) Hydraulic control apparatus for load independent flow regulation
EP0097246A2 (de) Ventilvorrichtung zum langsam unter Druck bringen von pneumatischen Systemen
US2268733A (en) Pneumatic safety control for presses
US2423482A (en) Fluid operated safety control for power presses and the like
US5125323A (en) Pressurized oil supply/discharge circuit and valve device for use in such circuit
US4802505A (en) Fluid control valve
US4690035A (en) Emergency draining device for stopping pneumatic cylinders
US6382243B2 (en) Pressure-reducing valve
EP2616723B1 (de) Volumenverstärker mit veränderbarer asymmetrie
GB2067268A (en) Suction regulator device for a compressor
KR20200013579A (ko) 바이패스 및 압력 조정 밸브
US4383476A (en) Apparatus for controlling a single action operating cylinder, especially of a press operating cylinder
US4580590A (en) Automatic air valve assembly
US4197867A (en) Relay indicator valve
EP0067934A2 (de) Druckluftspareinrichtung
US4513943A (en) Pressure medium actuated servo-motor system
US4027694A (en) Control valve
US2706968A (en) Speed control means for a fluidactuated motor

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB LI SE

17P Request for examination filed

Effective date: 19840204

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): CH DE FR GB LI SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850405