Control Valves

How does a pressure control valve work exactly? If we start closing the control valve, does pressure increase?

or decrease? and to be clear, since we are closing the control valve and therefore restricting flow, wouldnt the liquid pressure up before the control valve?

A pressure control valve is a pressure regulator. Its basic requirement is the input pressure must be higher than the output.
It automatically adjusts flow to maintain a steady output pressure.
It is not something you shut or open, but just adjust output pressure (if meant to be variable).
Most are set for a particular out pressure, and sealed off at that.

Discover Control Valves On eBay Below:

ECII FLOW CONTROL Valve FFA2002T NEW IN BOX
ECII FLOW CONTROL Valve FFA2002T NEW IN BOX
$35.00
Ross 1523B6002 Emergency Shut Off Lock Out Isolation Exhaust Flow Control Valve
Ross 1523B6002 Emergency Shut Off Lock Out Isolation Exhaust Flow Control Valve
$40.00
MAGNA Series 608 1 2 NPT Flow Control Valve Lot of 2
MAGNA Series 608 1 2 NPT Flow Control Valve Lot of 2
$29.99
Parker VDP 12H P 11 Linear Hydraulic Control Valve
Parker VDP 12H P 11 Linear Hydraulic Control Valve
$169.95
SMC AS 4001F Flow Control Valve
SMC AS 4001F Flow Control Valve
$20.77
Bellows L615 49 102 Speed Control Valve
Bellows L615 49 102 Speed Control Valve
$262.77
Rexroth 2LNF 6PP 2A B Control Valve
Rexroth 2LNF 6PP 2A B Control Valve
$308.77
Double A AA3 165 Control Valve
Double A AA3 165 Control Valve
$302.77
Fluid Controls 1L24 F4 25S Relief Valve
Fluid Controls 1L24 F4 25S Relief Valve
$732.77
Leslie UDRVP 11 Ratio 600 PSIG Pressure Range 035 100 Pilot Control Valve
Leslie UDRVP 11 Ratio 600 PSIG Pressure Range 035 100 Pilot Control Valve
$129.99
Fisher Controls 1K586935162 Stem Valve
Fisher Controls 1K586935162 Stem Valve
$79.77
Wabco Trailer Brake Control Valve 9730025210
Wabco Trailer Brake Control Valve 9730025210
$79.00
Directional control valve 4way Hydraulic 24V 4WEH20HD130 G24NET Rexroth Giori
Directional control valve 4way Hydraulic 24V 4WEH20HD130 G24NET Rexroth Giori
$375.00
ABEX DENISON PARKER DIRECTIONAL CONTROL VALVE A3D03 33 401 07 05 60BD
ABEX DENISON PARKER DIRECTIONAL CONTROL VALVE A3D03 33 401 07 05 60BD
$175.00
Legris 7625 04 11 Nylon Air Flow Control Valve 90 Degree Elbow Meter Out
Legris 7625 04 11 Nylon Air Flow Control Valve 90 Degree Elbow Meter Out
$0.01
Fisher 32B Control Valve
Fisher 32B Control Valve
$208.95
DC12V DN20 3 Wire Control Brass Motorized Ball Valve Electrical Ball Valve
DC12V DN20 3 Wire Control Brass Motorized Ball Valve Electrical Ball Valve
$33.26
Air Compressor Pressure Switch Control Valve 4 Ports 90 120PSI 26 AMP 240VAC
Air Compressor Pressure Switch Control Valve 4 Ports 90 120PSI 26 AMP 240VAC
$22.09
5 Port 2 Position 1 4 Inch Valve PT Hand Lever Operated Control Pneumatic Valve
5 Port 2 Position 1 4 Inch Valve PT Hand Lever Operated Control Pneumatic Valve
$13.26
New NiB Norgren R26 202 RNLA CONTROL VALVE PROPORTIONAL
New NiB Norgren R26 202 RNLA CONTROL VALVE PROPORTIONAL
$795.00
Rexroth Pneumatic DIRECTIONAL CONTROL VALVE 0821300989 Shipsameday 1611K
Rexroth Pneumatic DIRECTIONAL CONTROL VALVE 0821300989 Shipsameday 1611K
$350.00
New Bimba FQPS1K Flow Control Valve
New Bimba FQPS1K Flow Control Valve
$7.99
NEW Weir Valves  Control Seal Ring 336854058675 000 FREE SHIPPING
NEW Weir Valves Control Seal Ring 336854058675 000 FREE SHIPPING
$24.99
TOPWORX VALVETOP DISCRETE VALVE CONTROLLER DXP T21GNEB
TOPWORX VALVETOP DISCRETE VALVE CONTROLLER DXP T21GNEB
$114.99
Ross Controls 2783A9016 2 1 2 3 Way Air Piloted Nomally Closed Valve USED
Ross Controls 2783A9016 2 1 2 3 Way Air Piloted Nomally Closed Valve USED
$299.99
Alco Controls Power Assembly XB 1033 HW100 1B for TLE Valve   C1
Alco Controls Power Assembly XB 1033 HW100 1B for TLE Valve C1
$39.99
KITZ ACT TYPE C 2 FLOW CONTROL VALVE 1 1 2 IN W A110 4E1 71W KITZ SOLENOID
KITZ ACT TYPE C 2 FLOW CONTROL VALVE 1 1 2 IN W A110 4E1 71W KITZ SOLENOID
$229.95
Ross 2025A2904 Pendant Control Valve With Lever NIB
Ross 2025A2904 Pendant Control Valve With Lever NIB
$80.99
Ross 1968E3007 Flow Control Valve
Ross 1968E3007 Flow Control Valve
$16.00
NEW Norgren K41DA00 Air Control Valve Spring Return Solenoid FREE SHIPPING
NEW Norgren K41DA00 Air Control Valve Spring Return Solenoid FREE SHIPPING
$26.99
Norgren MK01GEA35ALJB Control Valve FREE SHIPPING
Norgren MK01GEA35ALJB Control Valve FREE SHIPPING
$49.99
LOT OF 3 A BAUMANN 1 150 STAINLESS STEEL CONTROL VALVE
LOT OF 3 A BAUMANN 1 150 STAINLESS STEEL CONTROL VALVE
$649.00
New HD Baumann 316 Stainless Steel Flow Control Valve 1 2 CF8M Part CL300
New HD Baumann 316 Stainless Steel Flow Control Valve 1 2 CF8M Part CL300
$315.00
Parker Colorflow Control Valve NS 600 S 12 Used 68959
Parker Colorflow Control Valve NS 600 S 12 Used 68959
$200.00
Parker Directional Control Valve D3T1H21X4544 Used 90567
Parker Directional Control Valve D3T1H21X4544 Used 90567
$249.00
Lot of 3 New Continental Hydraulic Directional Control Valve VSD03M 1A G 34L A
Lot of 3 New Continental Hydraulic Directional Control Valve VSD03M 1A G 34L A
$144.38
MAC VALVE 711C 11 AUTOMATION CONTROL NIB NOS
MAC VALVE 711C 11 AUTOMATION CONTROL NIB NOS
$39.99
Parker 032501500 Control Valve 1 1 2 Inch 32501500
Parker 032501500 Control Valve 1 1 2 Inch 32501500
$124.00
VAT 26424 KA11 0002 4035 VACUUM VALVE A 849860 Filter Control
VAT 26424 KA11 0002 4035 VACUUM VALVE A 849860 Filter Control
$45.83

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