Patents-Review.com
ClassID:

143668 ⎘

F04C28/12 - CPC Classification

Classification description:

Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using sliding valves

Sub-classes:
Recent Application in this class:
#1
20250188930
2025-06-12

SCREW COMPRESSOR

 #2
20250172144
2025-05-29

COMPRESSOR UNIT AND METHOD FOR OPERATING A COMPRESSOR UNIT

 #3
20240426301
2024-12-26

Device for controlling a fluid mass flow for a device for compressing a gaseous fluid and device for compressing a gaseous fluid

 #4
20240418169
2024-12-19

TWO-STAGE REFRIGERANT COMPRESSOR AND OPERATION METHOD THEREOF

 #5
20240352935
2024-10-24

Compact variable volume index valve for screw compressor background

 #6
20240318656
2024-09-26

VOLUME RATIO CONTROL SYSTEM FOR A COMPRESSOR

 #7
20240191713
2024-06-13

Slide Valve for a Twin-Screw Compressor

 #8
20240141895
2024-05-02

SCREW COMPRESSOR

 #9
20230035387
2023-02-02

Volume ratio control system for a compressor

 #10
20230029703
2023-02-02

Volume ratio control system for a compressor

 #11
20230027313
2023-01-26

Self-positioning volume slide valve for screw compressor

 #12
20220412357
2022-12-29

COMPRESSOR UNIT AND METHOD FOR OPERATING A COMPRESSOR UNIT

 #13
20220299031
2022-09-22

Variable volume ratio screw compressor

 #14
20220268280
2022-08-25

Dual-Stage Compressor, Control Method Thereof and Air Conditioning Unit

 #15
20220136506
2022-05-05

Slide valve of a single screw compressor

 #16
20220090601
2022-03-24

Screw compressor and control method therefor

 #17
20220042510
2022-02-10

Screw compressor slide valve and screw compressor with gas pulsation attenuation function

 #18
20210270269
2021-09-02

Slide valve, slide valve adjustment mechanism and screw compressor

 #19
20210131435
2021-05-06

Screw compressor having slide valve with crescent-shaped valve body and cylindrical guide portion

 #20
20210131434
2021-05-06

Positive-displacement compressor having an automatic compression ratio-adjustment system

 #21
20210115924
2021-04-22

Slide valve for compressor and screw compressor with slide valve

 #22
20210071668
2021-03-11

Variable economizer injection position

 #23
20210017987
2021-01-21

SYSTEMS AND METHODS FOR ENHANCED COMPRESSOR BEARING LIFE

 #24
20200291942
2020-09-17

Slide valve for a twin-screw compressor

 #25
20200208637
2020-07-02

Variable volume ratio screw compressor

 #26
20200200170
2020-06-25

Screw compressor having at least one control slide including piston rod with guide inserts

 #27
20200132074
2020-04-30

Rotary compressors with variable speed and volume control

 #28
20200080559
2020-03-12

Two-stage screw rotor machine with slide valves

 #29
20190376509
2019-12-12

Variable displacement pump

 #30
20190331114
2019-10-31

Bearing for a screw rotor of a screw compressor

 #31
20190249666
2019-08-15

Capacity control for chillers having screw compressors

 #32
20190032661
2019-01-31

Screw compressor including control sliders that cooperate to form an inflow chamber for inflow from a compression chamber and with one slider provided with an outflow outlet

 #33
20190032655
2019-01-31

Compressor unit and method for operating a compressor unit

 #34
20180356139
2018-12-13

Compressor control for increased efficiency

 #35
20180356128
2018-12-13

Converting compressor to variable VI compressor

 #36
20180209423
2018-07-26

Rotary compressor with vapor injection system

 #37
20180045201
2018-02-15

Variable-capacity compressor and refrigeration device having same

 #38
20180017059
2018-01-18

Variable economizer injection position

 #39
20170268510
2017-09-21

Compressor valve system and assembly

 #40
20170211574
2017-07-27

Screw compressor with control slider and detector

 #41
20170030356
2017-02-02

Screw compressor

 #42
20160327043
2016-11-10

Screw machine

 #43
20160319815
2016-11-03

Compressor comprising a variable volume index valve

 #44
20160169227
2016-06-16

Compressor

 #45
20150292762
2015-10-15

HVAC systems and controls

 #46
20150118091
2015-04-30

Rotary compressor with vapor injection system

 #47
20140260414
2014-09-18

Variable volume screw compressors using proportional valve control

 #48
20140134030
2014-05-15

Compressor valve system and assembly

 #49
20140127067
2014-05-08

Screw compressor having a volume ratio being adjusted by end faces extending along from a low-pressure side end wall to discharge edges of a slider

 #50
20140083130
2014-03-27

Apparatus and method for enhancing compressor efficiency

 #51
20130216414
2013-08-22

Volume ratio control system and method

 #52
20130171018
2013-07-04

Screw compressor with slide valve including a sealing projection

 #53
20130156624
2013-06-20

Slide valve for screw compressor

 #54
20130011291
2013-01-10

Single-screw compressor having an adjustment mechanism for adjusting a compression ratio of the compression chamber

 #55
20120282129
2012-11-08

Compressor

 #56
20120258005
2012-10-11

Single screw compressor

 #57
20120247139
2012-10-04

Piston operated bypass valve for a screw compressor

 #58
20120227437
2012-09-13

Stationary volume ratio adjustment mechanism

 #59
20120100028
2012-04-26

Screw compressor having slide valve with inclined end face

 #60
20120045354
2012-02-23

Air compression device

 #61
20120027632
2012-02-02

Compressor with a bypass port

 #62
20110256011
2011-10-20

Slide for use in a screw compressor

 #63
20110103988
2011-05-05

Compressor having capacity modulation system

 #64
20110097232
2011-04-28

Single screw compressor and a method for processing a screw rotor

 #65
20110083647
2011-04-14

Internal combustion engine and supercharger

 #66
20110083432
2011-04-14

Internal combustion engine and supercharger

 #67
20100272580
2010-10-28

Screw compressor having a slide valve with hot gas bypass port

 #68
20100260620
2010-10-14

Screw compressor with capacity control slide valve

 #69
20100254845
2010-10-07

Compressor

 #70
20100229595
2010-09-16

Compressor and refrigerating apparatus

 #71
20100209280
2010-08-19

SCREW COMPRESSOR PULSATION DAMPER

 #72
20100202904
2010-08-12

Screw compressor pulsation damper

 #73
20100183453
2010-07-22

Scroll compressor with three-step capacity control

 #74
20100158731
2010-06-24

Compressor having capacity modulation system

 #75
20100139301
2010-06-10

Temperature control through pulse width modulation

 #76
20100047103
2010-02-25

Integral slide valve relief valve

 #77
20090308471
2009-12-17

Startup bypass system for a screw compressor

 #78
20090280017
2009-11-12

Compressor slide valve support

 #79
20090246062
2009-10-01

Slide valve actuation for overpressure safety

 #80
20090196781
2009-08-06

Mode changing apparatus for a scroll compressor

 #81
20080240939
2008-10-02

Compressor having a high pressure slide valve assembly

 #82
20080206086
2008-08-28

Slide valve

 #83
20080206075
2008-08-28

Compressor having a dual slide valve assembly

 #84
20080131301
2008-06-05

Screw compressor lubrication

 #85
20080095653
2008-04-24

Compressor slide valve lubrication

 #86
20080085180
2008-04-10

VARIABLE CAPACITY NATURAL GAS COMPRESSOR

 #87
20070003421
2007-01-04

Two-stage screw compressor

 #88
20060165543
2006-07-27

Screw compressor acoustic resonance reduction

 #89
20060140804
2006-06-29

Apparatus for varying capacity in scroll compressor

 #90
20060104846
2006-05-18

Scroll compressor

 #91
20060039805
2006-02-23

Variable inner volume ratio-type inverter screw compressor

 #92
20050226758
2005-10-13

Screw compressor

 #93
18675818
2025-07-29

Self-positioning volume slide control with position feedback for screw compressor

 #94
18675800
2025-08-05

Self-positioning volume slide control for screw compressor