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:

ARO M291LS 10 M HAND CONTROL VALVE
ARO M291LS 10 M HAND CONTROL VALVE
$35.00
Vickers 0008 17AK Pneumatic Cylinder with Control Valve USED
Vickers 0008 17AK Pneumatic Cylinder with Control Valve USED
$49.99
NEW IN BAG PARKER 3251 3838 FLOW CONTROL BRASS 3 8IN NPT NEEDLE VALVE H134
NEW IN BAG PARKER 3251 3838 FLOW CONTROL BRASS 3 8IN NPT NEEDLE VALVE H134
$14.99
PARKER B622BB553A PNEUMATIC AIR CONTROL VALVE 150PSI  NIB NOS
PARKER B622BB553A PNEUMATIC AIR CONTROL VALVE 150PSI NIB NOS
$79.99
Leitenberger SPG501 Smart Pressure Gate 2 Exp Valve Fan  Evaporator Control
Leitenberger SPG501 Smart Pressure Gate 2 Exp Valve Fan Evaporator Control
$298.00
NUMATICS FLOW CONTROL VALVE 2FC1
NUMATICS FLOW CONTROL VALVE 2FC1
$20.00
Amot Controls 4057D013C1 solenoid valve
Amot Controls 4057D013C1 solenoid valve
$170.00
PARKER FLOW CONTROL VALVE N800S 11CV NEW
PARKER FLOW CONTROL VALVE N800S 11CV NEW
$25.19
Rexroth Flow Control Valve FE50C11 LN9M Used 88857
Rexroth Flow Control Valve FE50C11 LN9M Used 88857
$550.00
Amot Controls 4057D002A1 solenoid valve
Amot Controls 4057D002A1 solenoid valve
$150.00
Nachi Electro Proportional Flow Control Valve Model ES G03 60 E11
Nachi Electro Proportional Flow Control Valve Model ES G03 60 E11
$300.00
Parker 003371001 Micrometer Flow Control Valve Brass 250 PSIG
Parker 003371001 Micrometer Flow Control Valve Brass 250 PSIG
$32.00
Amot 3 4CMAT12001 Thermostatic Control Valve Size 3 4 Housing Aluminum
Amot 3 4CMAT12001 Thermostatic Control Valve Size 3 4 Housing Aluminum
$125.00
1 USED NUMATICS 5FC3 3 4 FLOW CONTROL VALVE
1 USED NUMATICS 5FC3 3 4 FLOW CONTROL VALVE
$31.99
VICKERS DGMFN 3 Y T2W 10 JA FLOW CONTROL VALVELOT OF 2
VICKERS DGMFN 3 Y T2W 10 JA FLOW CONTROL VALVELOT OF 2
$50.00
Mac Valves FC82A AA MAC Flow Control Valve New No Box
Mac Valves FC82A AA MAC Flow Control Valve New No Box
$20.38
HAYS ROMAC 1 2 2305 1081 FLOW CONTROL VALVE 20 GPM 160 PSI MAX 1 2 NPT
HAYS ROMAC 1 2 2305 1081 FLOW CONTROL VALVE 20 GPM 160 PSI MAX 1 2 NPT
$15.95
CA Norgren A1038B A1 1 1 2 inch 2 way poppet air control valve
CA Norgren A1038B A1 1 1 2 inch 2 way poppet air control valve
$257.20
BOSCH REXROTH DIRECTIONAL CONTROL VALVE 9810231081 081WV06P1V1020KA115 60 D51
BOSCH REXROTH DIRECTIONAL CONTROL VALVE 9810231081 081WV06P1V1020KA115 60 D51
$225.00
VICKERS DGMFN 3 Y A2W B2W 20 JA FLOW CONTROL VALVELOT OF 2
VICKERS DGMFN 3 Y A2W B2W 20 JA FLOW CONTROL VALVELOT OF 2
$50.00
MAXON ATMOSPHERE GAS CONTROL VALVE 1 1 4 100psi for ENDOTHERMIC FLUID 120V
MAXON ATMOSPHERE GAS CONTROL VALVE 1 1 4 100psi for ENDOTHERMIC FLUID 120V
$449.97
Hayward Flow Control Valve M TB1050STE NIB NEW SURPLUS
Hayward Flow Control Valve M TB1050STE NIB NEW SURPLUS
$16.66
JOHNSON CONTROLS VG7443GT+821E00 1 2 PNEUMATIC CONTROL VALVE NC
JOHNSON CONTROLS VG7443GT+821E00 1 2 PNEUMATIC CONTROL VALVE NC
$485.88
BETTIS ACTUATOR VALVE RPB450 SR4 CW WESTLOCK CONTROLS VALVE POSITION MONITOR
BETTIS ACTUATOR VALVE RPB450 SR4 CW WESTLOCK CONTROLS VALVE POSITION MONITOR
$400.00
NOS Deltrol Flow Control Needle Valve N20B 64A92B947 4820001281888
NOS Deltrol Flow Control Needle Valve N20B 64A92B947 4820001281888
$13.00
NOS Haldex Flow Control Valve N30099LB AE48370 AE80270 4820001150239
NOS Haldex Flow Control Valve N30099LB AE48370 AE80270 4820001150239
$90.00
NEW FC FISHER CONTROLS 2P330946622 CAGE VALVE SIZE 1 3576 S41000 HT CR PL
NEW FC FISHER CONTROLS 2P330946622 CAGE VALVE SIZE 1 3576 S41000 HT CR PL
$474.99
LOT OF 2 ROSS 2768B3900 CONTROL VALVE USED Q5
LOT OF 2 ROSS 2768B3900 CONTROL VALVE USED Q5
$39.95
GOYEN CONTROLS VALVE MODEL 2013 8 MADE IN AUSTRALIA
GOYEN CONTROLS VALVE MODEL 2013 8 MADE IN AUSTRALIA
$35.00
Parker Hydraulic Control Solenoid Valve 976784 Alt PN 0536U392
Parker Hydraulic Control Solenoid Valve 976784 Alt PN 0536U392
$599.99
2 NEW BOSCH 1ST 0 820 405 001 281 PNEUMATIC 2 WAY CONTROL AIR VALVE 1 2
2 NEW BOSCH 1ST 0 820 405 001 281 PNEUMATIC 2 WAY CONTROL AIR VALVE 1 2
$14.39
3 NEW BOSCH 1ST 0 820 405 001 281 PNEUMATIC 2 WAY CONTROL AIR VALVE 1 2
3 NEW BOSCH 1ST 0 820 405 001 281 PNEUMATIC 2 WAY CONTROL AIR VALVE 1 2
$20.89
GENUINE HUSCO A10A4337 DIRECTIONAL CONTROL LINEAR VALVE MICHIGAN CLARK M2511902
GENUINE HUSCO A10A4337 DIRECTIONAL CONTROL LINEAR VALVE MICHIGAN CLARK M2511902
$3,000.00
1 NEW MUELLER 511655 SS CONTROL WATER VALVE KATES REPAIR KIT MAKE OFFER
1 NEW MUELLER 511655 SS CONTROL WATER VALVE KATES REPAIR KIT MAKE OFFER
$74.99
Deltrol F 20 B Flow Control Valve 1 4
Deltrol F 20 B Flow Control Valve 1 4
$34.77
Deltrol F 20 B Flow Control Valve 1 4 Pack of 3 New No Box
Deltrol F 20 B Flow Control Valve 1 4 Pack of 3 New No Box
$59.80
USED GOOD PNEU TROL 1272 PNEUMATIC CONTROL VALVE 1 2 F 30 B FAST SHIPA205
USED GOOD PNEU TROL 1272 PNEUMATIC CONTROL VALVE 1 2 F 30 B FAST SHIPA205
$9.92
Proportion Air Pneumatic Control Valve QB1TFEE100
Proportion Air Pneumatic Control Valve QB1TFEE100
$99.99
Ross 517M1 1 2 Threaded Exhaust Flow Control Valve New
Ross 517M1 1 2 Threaded Exhaust Flow Control Valve New
$65.00

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