ClassID:

152456

F16K31/1221 - CPC Classification

Classification description:

Operating means Actuating devices; ; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded

Recent Application in this class:
#1
20260126127
2026-05-07

HYDRAULIC OR PNEUMATIC ACTUATOR FOR TRIP VALVES OF STEAM TURBINES OR TURBO-EXPANDERS

#2
20260085765
2026-03-26

VALVE APPARATUS OPERATED WITH A HIGH PRESSURE MOTIVE FLUID AND METHOD OF OPERATING THE SAME

#3
20260002598
2026-01-01

COMPACT VALVE SYSTEM

#4
20250389341
2025-12-25

SELF-REGULATING CONTROL VALVE

#5
20250369522
2025-12-04

ACTUATOR AND VALVE DEVICE

#6
20250345508
2025-11-13

ASPIRATION FLOW CONTROL VALVE

#7
20250341264
2025-11-06

ACTUATOR

#8
20250334201
2025-10-30

VALVE DEVICE, MOLDING MACHINE AND METHOD FOR CONTROLLING A VALVE DEVICE

#9
20250319573
2025-10-16

METERING VALVE FOR ABRASIVE MEDIA

#10
20250283535
2025-09-11

MOVEMENT CONTROL VALVE

#11
20250264160
2025-08-21

VALVE ASSEMBLY AND PISTON WITH DOUBLE O-RING INTERFACE AND RELIEF PASSAGE

#12
20250257812
2025-08-14

Valve

#13
20250250916
2025-08-07

BYPASS VALVE

#14
20250189050
2025-06-12

EXTRACTION VALVE AND VACUUM COLLECTION SYSTEM

#15
20250155031
2025-05-15

Corrosion-resistant diaphragm valve and assembling method thereof

#16
20250146596
2025-05-08

Safety Device for a Linearly Actuated Process Valve

#17
20250146595
2025-05-08

Linear Actuator for Actuating a Process Valve

#18
20250116349
2025-04-10

PNEUMATIC ACTUATOR ASSEMBLY FOR REDUCED DEAD LEG

#19
20250035225
2025-01-30

TIMING ADJUSTMENT VALVE AND SUCKBACK VALVE PROVIDED WITH SAME

#20
20250027570
2025-01-23

FLUID CONTROL VALVE

#21
20250021114
2025-01-16

Counterbalance valve with enhanced pressure sensing features

#22
20250020233
2025-01-16

Line Break Device

#23
20250018144
2025-01-16

VALVE WITH INTERNAL MEMBER

#24
20250012373
2025-01-09

FLUID-FLOW CONTROL DEVICE

#25
20240426394
2024-12-26

A VALVE CONTROL DEVICE

#26
20240351166
2024-10-24

PARTICLE BLAST APPARATUS

#27
20240344417
2024-10-17

PISTON ACTUATED VALVE APPARATUS

#28
20240342745
2024-10-17

METHOD OF OPERATING DRIPPAGE PREVENTION SYSTEM

#29
20240328536
2024-10-03

Emergency isolation valve control design

#30
20240328534
2024-10-03

Lift Valve Having Lift Drive

#31
20240295270
2024-09-05

DIFFERENTIAL PRESSURE DRIVEN DIAPHRAGM VALVE WITH SEPARATED DRIVE CHAMBER AND VALVE ACTUATION CHAMBER, AND ASSEMBLING METHOD THEREOF

#32
20240240720
2024-07-18

VALVE DEVICE

#33
20240229961
2024-07-11

VACUUM VALVE FOR A VACUUM CONVEYING SYSTEM

#34
20240229688
2024-07-11

Bypass valve

#35
20240217282
2024-07-04

AIR VALVE OF TIRE BEAD SEATER

#36
20240198486
2024-06-20

METERING VALVE FOR ABRASIVE MEDIA

#37
20240167573
2024-05-23

FLUID CONTROL DEVICE AND SUBSTRATE PROCESSING APPARATUS INCLUDING THE SAME

#38
20240125407
2024-04-18

ACTUATOR

#39
20240110637
2024-04-04

VALVE DEVICE

#40
20240110631
2024-04-04

Unloading valve assembly for compressed air processing system in a commercial vehicle

#41
20240084670
2024-03-14

A FLOW CONTROL DEVICE AND METHOD

#42
20240077066
2024-03-07

Pump Device

#43
20240052935
2024-02-15

Inlet section for use in a hydraulic distributor

#44
20240051771
2024-02-15

Gate valve, module with a valve and system for conveying of bulk goods with valves

#45
20240035586
2024-02-01

Pilot-operated valve with a position indicator

#46
20240019045
2024-01-18

Valve

#47
20230417341
2023-12-28

VALVE SYSTEM

#48
20230417036
2023-12-28

Pneumatic valve control device

#49
20230392710
2023-12-07

Integrated actuator manifold for multiple valve assembly

#50
20230383853
2023-11-30

FLUID CONTROL VALVE AND METHOD FOR MANUFACTURING THE SAME

#51
20230358334
2023-11-09

Piston for adjustable pressure reducing valve and an adjustable pressure reducing valve

#52
20230358317
2023-11-09

VALVE FOR COMPRESSED GAS WITH ACTUATING DEVICE OPERABLE BY A ROBOTIC INTERFACE

#53
20230349487
2023-11-02

Buffer valve

#54
20230349486
2023-11-02

Monitoring energy use on flow controls

#55
20230349475
2023-11-02

Buffer valve

#56
20230323972
2023-10-12

IMPROVEMENTS IN, OR RELATING TO, TRIGGER VALVES

#57
20230302269
2023-09-28

Apparatus for negative-pressure therapy and irrigation

#58
20230287988
2023-09-14

Pneumatically controlled valve unit, valve system, and method of operating a valve unit

#59
20230243238
2023-08-03

Fluid control system

#60
20230228343
2023-07-20

Fluid shut-off device

#61
20230228342
2023-07-20

Fluid control device

#62
20230213111
2023-07-06

Pump, multi-function valve, and controller apparatus

#63
20230204123
2023-06-29

Device for controlling fluid flow

#64
20230193793
2023-06-22

PRESSURE REGULATOR FOR ENGINE LUBRICATION SYSTEM

#65
20230193610
2023-06-22

Pneumatic valve control device

#66
20230191430
2023-06-22

Liquid dispensing spray nozzle assembly for rapidly producing small sized droplets of highly viscous liquids

#67
20230160492
2023-05-25

Valve manifold arrangements for fluid distribution system

#68
20230160479
2023-05-25

Systems and methods for purging liquid from a liquid fuel supply system

#69
20230147379
2023-05-11

Variable pressure control valve

#70
20230145382
2023-05-11

NORMALLY CLOSED VALVE FOR DRY PIPE TRIM ON A DIAPHRAGM VALVE

#71
20230136985
2023-05-04

ANTI FREEZE VALVE APPARATUS AND SEMICONDUCTOR PROCESSING DEVICE INCLUDING THE SAME AND MANUFACTURING METHOD THEREOF

#72
20230127835
2023-04-27

Inlet section for use in a hydraulic distributor

#73
20230119804
2023-04-20

Metering valve for abrasive media

#74
20230112308
2023-04-13

Arrangements and methods for controlled flow rate of pneumatic actuated valves

#75
20230065461
2023-03-02

PURGE VALVE FOR AN AIR-DRYING DEVICE AND AIR-DRYING DEVICE AND PRESSURIZED AIR-BASED SYSTEM AND COMMERCIAL VEHICLE

#76
20230062647
2023-03-02

Flow rate control valve and producing method of flow rate control valve

#77
20230058181
2023-02-23

Fluid component body with leak test passages

#78
20230058118
2023-02-23

Metering valve with mid-stroke shutoff

#79
20230053312
2023-02-16

VALVE ACTUATOR, VALVE ASSEMBLY AND METHOD

#80
20230051577
2023-02-16

Piston actuated valve apparatus

#81
20230046920
2023-02-16

Spring return actuator for rotary valves

#82
20230019352
2023-01-19

Valve and device for controlling pressures of a flow medium

#83
20230010656
2023-01-12

Device for regulating pressures of a flow medium using a valve

#84
20230003307
2023-01-05

Directional control hydraulic valve and system including same

#85
20220392784
2022-12-08

Apparatus for treating substrate using liquid and method for controlling liquid

#86
20220390030
2022-12-08

Arrangements and methods for controlled valve flow rate

#87
20220379495
2022-12-01

Valve device for a vacuum handling device or a vacuum clamping device

#88
20220362507
2022-11-17

Valve with internal member

#89
20220341441
2022-10-27

Safety module for a process valve and system

#90
20220316300
2022-10-06

Downhole Fluid Control System

#91
20220314266
2022-10-06

Liquid dispensing systems with reduced noise levels

#92
20220307606
2022-09-29

SELECTABLE FLUID COUPLER

#93
20220299132
2022-09-22

Actuator assembly for conducting partial stroke testing

#94
20220290768
2022-09-15

Multi-function subplate mounted valve

#95
20220275879
2022-09-01

Valve module, valve device, valve system

#96
20220275871
2022-09-01

DIAPHRAGM VALVE

#97
20220275867
2022-09-01

Control valve

#98
20220260171
2022-08-18

FLUID-FLOW CONTROL DEVICE

#99
20220252179
2022-08-11

Fluid distribution system with manifold assembly

#100
20220235880
2022-07-28

Partial stroke tests for shutdown valves

#101
20220235801
2022-07-28

Control valve with optimized cross-section

#102
20220229452
2022-07-21

Actuator for a pilot valve

#103
20220178456
2022-06-09

Relief valve

#104
20220178358
2022-06-09

Capacity control valve

#105
20220169224
2022-06-02

Hydropneumatic valve having a mechatronic module

#106
20220163137
2022-05-26

Grounded diaphragm with conductive layer

#107
20220147073
2022-05-12

Pressure regulator

#108
20220146008
2022-05-12

Temperature sensitive valve

#109
20220136598
2022-05-05

Drop-in lube-on-demand valve and kit

#110
20220089382
2022-03-24

Vacuum ejector and seal valve unit

#111
20220072569
2022-03-10

LIQUID DISPENSING SYSTEM WITH PRESSURIZED AIR OPERATED LIQUID CONTROL PISTONS

#112
20220072568
2022-03-10

Liquid dispensing spray nozzle assembly

#113
20220049775
2022-02-17

Diaphragm, valve device, and method for manufacturing diaphragm

#114
20220042606
2022-02-10

Slide valve

#115
20220040714
2022-02-10

Valve

#116
20220034410
2022-02-03

Proportional valve

#117
20220022391
2022-01-27

Pressure reducing valve with shut-off mechanism

#118
20220010885
2022-01-13

PRESSURE RELIEF VALVE

#119
20210370043
2021-12-02

APPARATUS FOR IRRIGATION WITH NEGATIVE PRESSURE

#120
20210341074
2021-11-04

Pressure actuator with biasing element

#121
20210332901
2021-10-28

Counterbalance Valve with Two Setting Springs in Parallel

#122
20210330956
2021-10-28

Apparatus for negative-pressure therapy and irrigation

#123
20210303008
2021-09-30

Fluid control apparatus, fluid control device, and operation analysis system

#124
20210300129
2021-09-30

Valve assembly and tire inflation system

#125
20210293350
2021-09-23

Diaphragm valve structure

#126
20210293349
2021-09-23

Diaphragm valve structure

#127
20210293348
2021-09-23

Diaphragm valve structure

#128
20210285551
2021-09-16

Control valve seat and seat support

#129
20210270386
2021-09-02

Device for controlling fluid flow

#130
20210262583
2021-08-26

Valve device

#131
20210262582
2021-08-26

PNEUMATIC VALVE POSITIONER WITH FEEDBACK CONTROLLED FLOW BOOSTER

#132
20210262214
2021-08-26

BIDET BACKFLOW PREVENTION DEVICE

#133
20210239235
2021-08-05

Actuator fail fix system

#134
20210239234
2021-08-05

Valve, modular system for manufacturing valves, and method of manufacturing valves

#135
20210230968
2021-07-29

Pump, multi-function valve, and controller apparatus

#136
20210221185
2021-07-22

Valve assembly and tire inflation system including said valve assembly

#137
20210190219
2021-06-24

Switching valve, valve apparatus, holding apparatus, lithography apparatus, and method of manufacturing article

#138
20210187675
2021-06-24

Poppet, assembly, and methods of assembling and using the same

#139
20210180710
2021-06-17

Pressure regulator and method of using the same

#140
20210165431
2021-06-03

Reverse modulation valve assembly including deadband state

#141
20210140905
2021-05-13

Sensor tube of humidity sensor, tube assembly, and humidity sensor system

#142
20210140560
2021-05-13

Self sealing jetting valve

#143
20210140551
2021-05-13

Multi-function subplate mounted valve

#144
20210131334
2021-05-06

Coolant control valve

#145
20210116047
2021-04-22

Fluid control device

#146
20210115838
2021-04-22

Control valve for a heat management module

#147
20210108738
2021-04-15

Arrangements and methods for controlled flow rate of pneumatic actuated valves

#148
20210102638
2021-04-08

Adsorption processes and systems utilizing step lift control of hydraulically actuated poppet valves

#149
20210102636
2021-04-08

VALVE DEVICE

#150
20210088150
2021-03-25

Hydrant valve with internal shut-off valve

#151
20210077937
2021-03-18

Pulse valve

#152
20210072774
2021-03-11

Pressure regulator for fuel cell system

#153
20210071776
2021-03-11

Apparatus, systems, and methods for controlling valve actuation speed

#154
20210069644
2021-03-11

Variable drain flow restrictor

#155
20210069456
2021-03-11

Valve with internal member

#156
20210048111
2021-02-18

Fluid valve

#157
20210048110
2021-02-18

Set of jigs for assembling a valve, and a diaphragm valve assembled with the same

#158
20210041038
2021-02-11

Arrangement with on/off valve, pneumatic actuator, magnetic valve and function monitoring device

#159
20210040964
2021-02-11

Piston-cylinder unit

#160
20210033204
2021-02-04

Pinch valve

#161
20210016316
2021-01-21

Method of operating drippage prevention system

#162
20200408066
2020-12-31

FLOW CONTROL DEVICE AND METHOD

#163
20200400240
2020-12-24

Failsafe close valve assembly

#164
20200398809
2020-12-24

Valve assembly and system including same for controlling fluid flow to and from a clutch

#165
20200393856
2020-12-17

Proportional flow control and counterbalance valve having single seat configuration

#166
20200393855
2020-12-17

Proportional flow control valve with counterbalance valve integrated therewith

#167
20200393056
2020-12-17

Valve for aircraft inflation system

#168
20200378523
2020-12-03

Magnetically latched pneumatic valve

#169
20200362729
2020-11-19

Steam valve driving apparatus, steam valve apparatus, and steam turbine plant

#170
20200347957
2020-11-05

Expandable pilot assembly for pressure regulators

#171
20200326316
2020-10-15

Valve assembly for a gas chromatograph

#172
20200326003
2020-10-15

Axial piston machine with valve slides integrated into the connector plate

#173
20200309247
2020-10-01

Hydraulic control valve

#174
20200308925
2020-10-01

Annulus safety valve system and method

#175
20200300383
2020-09-24

Fluid control valve

#176
20200300379
2020-09-24

GAS VALVE

#177
20200278033
2020-09-03

Valve apparatus, flow rate adjusting method, fluid control apparatus, flow rate control method, semiconductor manufacturing apparatus, and semiconductor manufacturing method

#178
20200277971
2020-09-03

Vacuum breaking device for vacuum generator

#179
20200277839
2020-09-03

System and methodology for controlling actuation of devices downhole

#180
20200271113
2020-08-27

Pneumatically controlled drain valve

#181
20200263803
2020-08-20

Valve actuating system

#182
20200256479
2020-08-13

Steam valve driving apparatus

#183
20200256207
2020-08-13

Systems and methods for protecting a turbomachine

#184
20200248833
2020-08-06

Actuator, valve device, and fluid control apparatus

#185
20200248831
2020-08-06

Integrated actuator manifold for multiple valve assembly

#186
20200248818
2020-08-06

Hemispherical Poppet Valve For Rotary Screw Compressor Intake Valves

#187
20200248685
2020-08-06

Vacuum pressure proportional control valve

#188
20200217175
2020-07-09

Downhole fluid control system

#189
20200208755
2020-07-02

Low noise gate valve

#190
20200208623
2020-07-02

Pneumatic Motor Comprising Active Stroke-Switching System

#191
20200182369
2020-06-11

Actuator

#192
20200182357
2020-06-11

Control valves

#193
20200158255
2020-05-21

Pilot actuated control pilot for operating valve

#194
20200158253
2020-05-21

Bilateral and throttling directional control valve

#195
20200158252
2020-05-21

Actuator fail fix system

#196
20200149653
2020-05-14

Actuator and valve device

#197
20200149645
2020-05-14

Temperature sensitive valve

#198
20200132212
2020-04-30

No-bolt valve assembly system

#199
20200124202
2020-04-23

PNEUMATIC ACTUATOR

#200
20200103037
2020-04-02

Regulating device for pump pressure and pump volumetric flow rate, having concentric control slide valves

#201
20200096114
2020-03-26

Pilot-actuated spool valve having rod retainer

#202
20200089260
2020-03-19

Pressure regulator for fuel cell system

#203
20200086699
2020-03-19

Advanced rapid air release valve pneumatic tire seater

#204
20200072384
2020-03-05

Diaphragm valve structure and thermal isolation method thereof

#205
20200072364
2020-03-05

Valve

#206
20200063887
2020-02-27

Top cover for a soft throttling valve body, soft throttling valve and method for assembling a soft throttling valve

#207
20200063876
2020-02-27

Electromagnetically actuated fluidic-device valve apparatuses, systems, and methods

#208
20200056721
2020-02-20

Liquid dispensing device having a nozzle and needle assembly

#209
20200056707
2020-02-20

Smart pinch valve

#210
20200012300
2020-01-09

FILTER-INCLUDED ENERGY-SAVING LARGE-CAPACITY DIRECT-ACTING PRECISION PRESSURE REGULATION VALVE

#211
20200011451
2020-01-09

Partial stroke tests for shutdown valves

#212
20190382215
2019-12-19

Vacuum ejector and seal valve unit

#213
20190368631
2019-12-05

Method for monitoring a mechanical system

#214
20190368630
2019-12-05

High flow multi-way piston valve for deposition systems

#215
20190361469
2019-11-28

Hybrid flow and pressure regulation

#216
20190360598
2019-11-28

Bleed valves

#217
20190353273
2019-11-21

Double action direction fluid flow valve

#218
20190346059
2019-11-14

Actuator and method for setting an actuator

#219
20190345867
2019-11-14

Motor vehicle

#220
20190331251
2019-10-31

LINEAR ACTUATOR

#221
20190321942
2019-10-24

Particle blast apparatus

#222
20190309837
2019-10-10

Valve with a locked set screw that is covered with a cap having a rotation space fitting freely over a nut and a female threaded portion screwed onto the set screw

#223
20190301627
2019-10-03

Passive valve

#224
20190301624
2019-10-03

Valve with segmented spring guide assembly

#225
20190282960
2019-09-19

Variable drain flow restrictor

#226
20190277426
2019-09-12

Media control valve tank testing apparatus and method

#227
20190277424
2019-09-12

Inline air valve nose cap for reduced contamination

#228
20190277183
2019-09-12

Electric coolant pump

#229
20190271410
2019-09-05

Actively cooled vacuum isolation valve

#230
20190271409
2019-09-05

Valve body having primary and secondary stem guides

#231
20190271407
2019-09-05

Pneumatically controllable valve assembly, tire inflation system, and methods of operating the valve assembly and the tire inflation system

#232
20190264829
2019-08-29

Slow-shift SPM valve

#233
20190264826
2019-08-29

Valve assembly for use in a flow management system

#234
20190257441
2019-08-22

Sprung gate valves movable by an actuator

#235
20190257432
2019-08-22

Fluid control valve and fluid control valve manufacturing method

#236
20190249798
2019-08-15

Determining the operability of a fluid driven safety valve

#237
20190249785
2019-08-15

Warm water recirculating valve using direct water supply tube

#238
20190212757
2019-07-11

Pressure regulating valve for an air supply system of a utility vehicle

#239
20190203851
2019-07-04

Switch for diaphragm valve actuator

#240
20190195389
2019-06-27

Valve module with wireless energy-transfer unit

#241
20190195386
2019-06-27

No-bolt latching system

#242
20190195384
2019-06-27

Fluid valve and opening motion promoting device

#243
20190186647
2019-06-20

Valve

#244
20190178412
2019-06-13

Axially restricted pressure shuttle

#245
20190178399
2019-06-13

Non-return valve mechanism and one-way valve device

#246
20190178394
2019-06-13

Fluid control valve and fluid control valve assembling method

#247
20190162327
2019-05-30

Self sealing jetting valve

#248
20190151869
2019-05-23

Fluid dispensing apparatus and methods utilizing a resilient nozzle

#249
20190145542
2019-05-16

Control of supply of air to a pneumatic valve actuator

#250
20190145531
2019-05-16

Safety valve

#251
20190143072
2019-05-16

Valve with internal member

#252
20190136993
2019-05-09

Hydrant valve with internal shut-off valve

#253
20190128441
2019-05-02

Pressure-Balanced Fluidic Actuation Mechanism for a Valve

#254
20190128427
2019-05-02

Booster assembly for gate valves

#255
20190120376
2019-04-25

Transmission park control system

#256
20190107222
2019-04-11

Rotary stepping actuator for valve

#257
20190107220
2019-04-11

Valve drive system for a pneumatic or hydraulic valve

#258
20190107206
2019-04-11

Valve for controlling coolant flow and fuel cell cooling system using the same

#259
20190107033
2019-04-11

Valve for adjusting a cooling fluid flow for piston cooling

#260
20190101070
2019-04-04

Pressure regulating modules with controlled leak paths

#261
20190093774
2019-03-28

Switching valve

#262
20190093772
2019-03-28

Diaphragm valve assembling method, diaphragm valve assembly structure, and diaphragm valve

#263
20190079542
2019-03-14

Pressure compensated flow controller with only two pressures

#264
20190064856
2019-02-28

Hybrid flow and pressure regulation

#265
20190063635
2019-02-28

Actuator

#266
20190063630
2019-02-28

Attachment structure for actuator-specific solenoid valve and actuator-equipped valve

#267
20190063622
2019-02-28

Variable orifice flow control device

#268
20190063466
2019-02-28

Fluid control valve

#269
20190048992
2019-02-14

SYSTEM FOR CONTROLLING A VEHICLE TRANSMISSION SUMP FLUID LEVEL

#270
20190040973
2019-02-07

Compound express actuator connection

#271
20190040965
2019-02-07

Flow dividing valve

#272
20190032811
2019-01-31

DAMPED RELIEF VALVE USING DOUBLE PISTONS

#273
20190024478
2019-01-24

Downhole fluid control system

#274
20190003612
2019-01-03

TWO-WAY TWO POSITION IN-LINE VALVE

#275
20190003330
2019-01-03

Stop valve and steam turbine

#276
20180371935
2018-12-27

Valve system and steam turbine

#277
20180371719
2018-12-27

System and method for hydraulic actuator lock valve

#278
20180363790
2018-12-20

UNIVERSAL AIR PRESSURE VALVE MODULE

#279
20180363416
2018-12-20

Pressurized seat check valve

#280
20180355998
2018-12-13

Balanced regulating valve

#281
20180355996
2018-12-13

Double action direction fluid flow valve

#282
20180355986
2018-12-13

Control valve

#283
20180355697
2018-12-13

Annulus access valve

#284
20180348797
2018-12-06

FLUID CONTROL VALVE DEVICE

#285
20180347717
2018-12-06

Dual cylinder pressure equalization system

#286
20180333738
2018-11-22

Drippage prevention system and method of operating same

#287
20180328505
2018-11-15

Actuator for Linked Poppet Valve

#288
20180320798
2018-11-08

Reflexive valve preservation and actuation system and method

#289
20180292117
2018-10-11

High flow filling equipment and method

#290
20180283563
2018-10-04

Metal diaphragm valve

#291
20180281253
2018-10-04

GAS EXHAUSTING DEVICE FOR INJECTION MOLD

#292
20180274444
2018-09-27

Valve assembly with oil shut-off valve

#293
20180259950
2018-09-13

Valve controller and method for monitoring flow control valve

#294
20180259090
2018-09-13

Method for producing an actuator

#295
20180259083
2018-09-13

Valve body having primary and secondary stem guides

#296
20180259078
2018-09-13

Spring seat for an internal valve

#297
20180254209
2018-09-06

Gas injection device

#298
20180245698
2018-08-30

Proportionally controlled pinch valves, systems and methods

#299
20180217619
2018-08-02

Positive sealing proportional control valve with sealable vent valve

#300
20180216539
2018-08-02

Pneumatically-actuated bypass valve