Pressure Unloader

• Automatic Pressure Compensating Unloader Valve
• General # YU3678
• Must Be Mounted Vertically
• Reduces trapped pressure to 25% of operating pressure when unloading
• Allows easier trigger gun pull
• Maximum Pressure: 3,600 PSI
• Max. Volume: 7.8 GPM
• Adjustable pressure
• Brass body
• Max. Fluid Temp.: 194 degrees F.
• Inlet Ports (1): 3/8" FPT
• Discharge Ports (1): 3/8” FPT
• Bypass Ports (1): 3/8” FPT
• 40.0 OZ. Weight

PA Pulsar 4 Unloader Valve 4,050 PSI with built-in Easy Start. Built-In easy start valve relieves back pressure during engine start up

Features
• NEW improved design!
• Reduced pressure loss
• Makes for easier gun operation
• Extremely reliable
• Easy maintenance
• Includes knob fitted with locknut for easy pressure adjustment
• Facilitates water discharge in pressure during start-up
• Reduces energy required for start-up

Specifications Sheet

Specifications:
• Rated Pressure: 4,050 PSI
• Permissible Pressure: 4,500 PSI
• Rated Temperature: 195° F
• Rated Flow Rate: 10.5 GPM
• Material: Steel and brass
• Inlet Port (1): 3/8" NPT-F
• Outlet Port (1): 3/8" NPT-F
• Bypass Ports (2): 3/8" NPT-F
• NOTE: Unloader Must Be Installed Vertically For Proper Operation
• Replaces Pulsar 280 #60.0006.90
• GP #: PULSAR4KHPEZ
• Weight: 26.0 oz

General YU21405 green spring trapped pressure unloader valve.

Specifications:
• Spring Color: Green
• Maximum Pressure: 4,500 PSI
• Rated Pressure: 4,050 PSI
• Max. Volume: 21.0 GPM
• Adjustable pressure
• Forged brass body
• Maximum Temperature: 200° F
• Inlet Ports (2): 1/2" FPT
• Discharge Port: 1/2” FPT
• Bypass Ports (2): 1/2” FPT
• Weight: 3.1 lb

General Pump ZH1520 Trapped Pressure Unloader Valve 2,465 PSI 52.8 GPM 1” NPT-F

Features
• Suitable for Industrial use
• Provisions for Panel Mounting
• Suitable for Industrial use
• Single bypass port
• Extremely reliable
• Easy maintenance

Specifications Sheet

Specifications
• Max Volume: 52.8 GPM
• Min Volume: 5.28 GPM
• Maximum Operating Pressure: 2,465 PSI
• Maximum Temperature: 185° F
• Inlet Port: 1" NPT-F
• Outlet Port: 1" NPT-F
• Bypass Port: 1" NPT-F
• Dimensions: 8.27” x 5.07” x 1.81”
• VRP175, VRP 175
• Weight: 4.4 Lbs

General Pump ZH168 Trapped Unloader (White) 2,320 PSI 21.1 GPM 1/2” NPT-F

Features
• Suitable for Industrial use
• Dual bypass port
• Extremely reliable
• Easy maintenance

Specifications Sheet

Specifications
• Max Volume: 21.1 GPM
• Maximum Operating Pressure: 2,320 PSI
• Maximum Temperature: 185° F
• Inlet: (2) 1/2" NPT-F
• Outlet: 1/2" NPT-F
• Bypass: 1/2" NPT-F
• Spring Color: White
• Dimensions: 9.15” x 3.69” x 1.81”
• Weight: 2..87 Lbs

General Pump ZH288 Trapped Unloader (Blue/Green) 4,060 PSI 21.1 GPM 1/2” NPT-F

Features
• Suitable for Industrial use
• Dual bypass port
• Extremely reliable
• Easy maintenance

Specifications Sheet

Specifications
• Max Volume: 21.1 GPM
• Maximum Operating Pressure: 4,060 PSI
• Maximum Temperature: 185° F
• Inlet: (2) 1/2" NPT-F
• Outlet: 1/2" NPT-F
• Bypass: 1/2" NPT-F
• Spring Color: Green
• Note: Spring color changed to green late 2022
• Dimensions: 9.15” x 3.69” x 1.81”
• Weight: 2.87 Lbs

• Trapped Pressure Unloader
• Maximum Pressure: 3,000 PSI
• Max. Volume: 10.8 GPM
• Adjustable pressure
• Brass body
• Max. Fluid Temp.: 195 degrees F.
• Inlet Ports (1): 3/8" FPT
• Discharge Ports (1): 3/8” MPT
• Bypass Ports (2): 3/8” FPT
• Auxiliary Ports (1): 1/4” FPT
• 2.3 lb. weight

• AR North America AR2907 Zeromatic/83 Multi-Gun Unloader
• Maximum Pressure: 3,600 PSI
• Max. Volume: 3 - 10 GPM
• Brass body
• Max. Fluid Temp.: 190° F.
• Inlet Port: 1/2" FPT
• Outlet Port: 3/8” MPT
• Bypass Ports (2): 3/8” FPT

• AR unloader valve
• Maximum Pressure: 5,100 PSI
• Max. Volume: 9.0 GPM
• Adjustable pressure
• Black knob
• Forged brass body
• Inlet Ports (1): 3/8"MPT
• Discharge Ports (1): 3/8” MPT
• Bypass Port: 3/8” FPT
• Weight: 2.5 lbs