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Unloader Valves

The Unloader Valve’s function is to direct the flow of water exiting the pump. A positive displacement pump continuously pumps water with or without the spray gun being engaged. When the gun is closed, the Unloader Valve prevents the build up of dangerously high pressures by rerouting the water back to the inlet side of the pump. We and manufacturers recommend using a Pressure Relief Valve in conjunction with Unloader Valves when installed on a positive displacement pump.
Adjustable Trapped Pressure Unloaders - General Pump

Model GPM Pressure Inlet Outlet Bypass Temp. Qty Unit Price
YU3678 8 3650 3/8 NPT-F 3/8 NPT-F --- 195°
$99.99
YU3678MS 8 3650 3/8 NPT-F 1/2 NPT-M --- 195°
$108.99
YU4050K 10 4500 3/8 BSP-M 3/8 BSP-F 1/2 BSP-F 195°
$122.99
YU5075K 10 5650 3/8 BSP-M 3/8 BSP-F 1/2 BSP-F 195°
$147.99
YU5075KMM 10 5650 3/8 BSP-M 3/8 BSP-F 1/2 BSP-F 195°
$119.99
YU5075KMS 10 5650 3/8 BSP-M 3/8 BSP-F 3/8 BSP-F 195°
$243.99
YU5075KS 10 5650 3/8 BSP-M 3/8 BSP-F 1/2 BSP-F 195°
$150.99
YVB3K 6.5 3650 3/8 BSP-M 3/8 BSP-M 3/8 BSP-M 195°
$56.99
YVB3KA 6.5 3650 3/8 NPT-M 3/8 NPT-M 3/8 NPT-M 195°
$53.99
YVB3KTT 6.5 3650 1/4 NPT-M 3/8 NPT-M 3/8 NPT-F 195°
$57.99
YVB3KTTI18 6.5 3650 1/4 NPT-M 3/8 NPT-M 3/8 NPT-F 195°
$66.99
YVB3KTTI21 6.5 3650 1/4 NPT-M 3/8 NPT-M 3/8 NPT-F 195°
$66.99
YVB3KTTI23 6.5 3650 1/4 NPT-M 3/8 NPT-M 3/8 NPT-F 195°
$66.99
YVB5K 8 3650 3/8 BSP-M 3/8 BSP-F 3/8 BSP-F 195°
YVB7K 8 3650 3/8 NPT-M 3/8 NPT-F 3/8 NPT-F 195°
$64.99
YVB8KMS 8 3650 3/8 BSP-F 3/8 BSP-F 3/8 BSP-F 195°
$80.99
YVB9K 8 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$79.99
YVB9KMS2 8 3650 3/8 BSP-F 3/8 BSP-F 3/8 BSP-F 195°
$99.99
YVB9KMSS 8 3650 3/8 BSP-F 1/2 BSP-M 3/8 BSP-F 195°
$113.99
ZKHM 10.8 3000 3/8 BSP-F 1/4 BSP-F 3/8 BSP-F 195°
$79.99
ZKHM1 10.8 3000 3/8 BSP-F 1/4 BSP-F 3/8 BSP-F 195°
$88.99


Trapped Pressure Unloaders - General Pump

Model GPM Pressure Inlet Outlet Bypass Temp. Qty Unit Price
PULSAR3 8.1 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
PULSAR3HP 8.1 4000 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
PULSAR3KHP 8.1 4000 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
PULSAR3KHPEZ 8 4000 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
PULSAR3KMS2 8 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$105.99
Y60012205 8 1500 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$67.99
YU2121 21 2450 1/2 NPT-F 1/2 NPT-F 1/2 NPT-F 200°
$109.99
YU2140 21 4350 1/2 NPT-F 1/2 NPT-F 1/2 NPT-F 200°
$103.99
YU2158 21 6500 1/2 NPT-F 1/2 NPT-F 1/2 NPT-F 200°
$424.99
YU5221 53 2450 1 NPT-F 1 NPT-F 1 NPT-F 200°
$371.99
YU815 8 1750 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$62.99
YU815D 8 1750 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$62.99
YU815DRK 8 1750 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$62.99
YU815RK 8 1750 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$62.99
YU831 8 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
YU831D 8 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
YU831DI 8 3650 3/8 NPT-F 3/8 NPT-M 3/8 NPT-F 195°
$82.99
YU831DIRK 8 3650 3/8 BSP-F 3/8 BSP-F 3/8 BSP-F 195°
$85.99
YU831RK 8 3650 3/8 NPT-F 3/8 NPT-F 3/8 NPT-F 195°
$64.99
YUB2140 21 4350 1/2 NPT-F 1/2 NPT-F 1/2 NPT-F 200°
$103.99
YUW2121 21 2450 1/2 NPT-F 1/2 NPT-F 1/2 NPT-F 200°
$92.99
ZK3608 8 3600 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$96.99
ZK4010 10.5 4000 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 185°
$109.99
ZK5813 13.2 5800 1/2 BSP-F 1/2 BSP-M 1/2 BSP-F 185°
$379.99


Control Set Pressure Unloaders - General Pump

Model GPM Pressure Inlet Outlet Bypass Temp. Qty Unit Price
190043 4.5 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$134.99
YU4050KDM 10 4500 3/8 BSP-F 3/8 BSP-M --- 195°
$138.99
YVB135KDM 6.5 2600 3/8 BSPP-F 3/8 BSPP-M --- 195°
$59.99
YVB135KDMI18 6.5 2600 3/8 BSPP-F 3/8 BSPP-M --- 195°
$82.99
YVB135KDMI21 6.5 2600 3/8 BSPP-F 3/8 BSPP-M --- 195°
$82.99
YVB135KDMI23 6.5 2600 3/8 BSPP-F 3/8 BSPP-M --- 195°
$82.99
YVB351KDM 6.5 3650 3/8 BSP-F 1/4 BSP-F --- 195°
$70.99
YVB351KDMI18 6.5 3650 3/8 BSP-F 1/4 BSP-F --- 195°
$81.99
YVB35KDM 6.5 3650 1/2 BSP-F 3/8 BSP-M --- 195°
$78.99
YVB35KDMI18 6.5 3650 1/2 BSP-F 3/8 BSP-M --- 195°
$93.99
YVB35KDMI21 6.5 3650 1/2 BSP-F 3/8 BSP-M --- 195°
$93.99
YVB55KDM 8 3650 1/2 BSP-F 3/8 BSP-F --- 195°
$73.99
YVB55KDMI21 8 3650 1/2 BSP-F 3/8 BSP-F --- 195°
$83.99
YVB75KDMN 7.8 3650 1/2 BSP-F 3/8 BSP-F --- 195°
$79.99
YVB75KDMN21 7.8 3650 1/2 BSP-F 3/8 BSP-F --- 195°
$88.99
YVB75KTP 8 3650 3/8 BSP-F 3/8 BSP-M --- 195°
$80.99
YVB75KTPF21 8 3650 3/8 BSP-F 3/8 BSP-M --- 195°
$91.99
Z0KR1 2.1 1000 3/8 BSP-F M22 --- 165°
$123.99
ZKW1 3 1600 3/8 BSP-F 3/8 BSP-M --- 165°
$101.99
ZKW1SC 3 1600 3/8 BSP-F 3/8 BSP-M --- 165°
$99.99
ZKW21 4.5 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$119.99
ZKW21L 4.5 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$119.99
ZKW22L 6 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$129.99
ZKW2LSC 6 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$119.99
ZKW2SC 4.5 3000 1/2 BSP-F 3/8 BSP-M --- 200°
$119.99
ZKW326 2.6 3000 1/2 BSP-F 3/8 BSP-M --- 165°
$104.99
ZKW340 4 3000 1/2 BSP-F 3/8 BSP-M --- 165°
$104.99
ZKW355 5.5 3000 1/2 BSP-F 3/8 BSP-M --- 165°
$104.99


Flow Sensitive Unloaders - General Pump

Model GPM Pressure Inlet Outlet Bypass Temp. Qty Unit Price
190009 6.6 3000 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$109.99
190079 4.2 3000 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$109.99
190361 10.8 3000 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$109.99
ZK1 10.8 3600 3/8 BSP-F 1/2 BSP-M 1/2 BSP-M 165°
$84.99
ZK138 10.8 3600 3/8 BSP-F 3/8 BSP-M 1/2 BSP-M 165°
$84.99
ZK30 3 1500 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$76.99
ZK31 4.2 1500 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$76.99
ZK32 5.5 1500 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$76.99
ZK33 6 1500 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$76.99
ZK50 3 3000 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$78.99
ZK51 4.2 3000 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$78.99
ZK52 6.6 3000 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$78.99
ZK53 10.8 3000 3/8 BSP-F 3/8 BSP-M 3/4 BSP-M/F 165°
$78.99
ZK70 3 3500 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$103.99
ZK71 4.2 3500 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$103.99
ZK72 6.6 3500 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$103.99
ZK73 10.8 3500 3/8 BSP-F 3/8 BSP-M 3/8 BSP-F 165°
$103.99
ZK9 11 5800 3/8 BSP-F 3/8 BSP-M 1/2 BSP-F 165°
$490.99





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