Unloader, Safety & Flow Control Valves

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Unloader, safety, and flow control valves are essential components in any pressure washing system. Unloader valves regulate pressure and allow your pump to bypass water when the trigger is released, while relief and safety valves provide protection against overpressure to safeguard pumps, hoses, and other equipment. Flow regulators play a complementary role by controlling and stabilizing water flow, which is particularly useful in multi-gun setups, chemical applications, and when using attachments that require consistent performance, helping ensure smooth, efficient, and reliable operation.

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Canpump

Canpump Unloader Valve - 4000 psi @ 6.6 US gpm, Easy Start

Chemical injector: Yes

Inlet: 3/4-in Garden Hose Female

Outlet: 3/8-in Female or Quick-Connect Socket

Inlet Banjo Bolt: 1/2-in Male

Outlet Banjo Bolt: 3/8-in Male

MSRP:

Was:

Price Now:

$49.00 - $52.00

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P.A.

SKU: 041017

P.A. VS 220: 3200 psi @ 6.3 US gpm Safety/Relief Valve, 2 Inlet Ports

Inlet: 3/8-in Female

Outlet: 3/8-in Female

MSRP:

Was:

Price Now:

$43.20
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P.A.

SKU: 041010

P.A. Pulsar Rv: 4050 psi @ 10 US gpm Unloader Valve w/ Knob

Chemical injector: No

Inlet: 3/8-in Female

Outlet: 3/8-in Female

Bypass: 3/8-in Female

MSRP:

Was:

Price Now:

$68.00

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Canpump

SKU: 041021

Adjustable Pressure Safety Valve, 5000 psi, 3/8-in Inlet

Inlet: 3/8-in Male

MSRP:

Was:

Price Now:

$20.00

Out of stock
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P.A.

SKU: 041013

P.A. VB 350: 5075 psi @ 10.5 US gpm Unloader Valve w/ Knob

Chemical injector: No

Inlet: 3/8-in Male

Outlet: 3/8-in Female

Bypass: 1/2-in Female

MSRP:

Was:

Price Now:

$110.00
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Canpump

SKU: 500059

Canpump Universal Bypass Kit for 3/8-in Unloader Valve

Inlet: 3/4-in Garden Hose Female

Outlet: 3/8-in Male NPT to 3/8-in Quick-Connect Socket

Bypass: 3/8-in Male NPT to Barbed Fitting

MSRP:

Was:

Price Now:

$28.00
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P.A.

SKU: 042001

P.A. VB 80/400: 5800 psi @ 21 US gpm Stainless-Steel Unloader Valve

Chemical injector: No

Inlet: 1/2-in Female

Outlet: 1/2-in Female

Bypass: 1/2-in Female

MSRP:

Was:

Price Now:

$380.00

Out of stock
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Mecline

SKU: 042007

Mecline VRT100 High Flow: 5075 psi @ 26.4 US gpm Unloader Valve

Chemical injector: No

Inlet: 1/2-in Female

Outlet: 1/2-in Female

Bypass: 1/2-in Female

MSRP:

Was:

Price Now:

$156.00

Out of stock
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P.A.

SKU: 042005

P.A. VB 85/310: 4050 psi @ 21 US gpm Unloader Valve

Chemical injector: No

Inlet: 1/2-in Female

Outlet: 1/2-in Female

Bypass: 1/2-in Female

MSRP:

Was:

Price Now:

$118.00
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Canpump

Canpump Thermal Relief Valve for Hi-Pressure Triplex Pumps

Inlet: 1/4-in Male

Inlet: 3/8-in Male

Inlet: 1/2-in Male

MSRP:

Was:

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$9.60 - $11.20

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P.A.

SKU: 042004

P.A. VB 53: 7250 psi @ 21 US gpm Stainless-Steel Unloader Valve

Chemical injector: No

Inlet: 1/2-in Female

Outlet: 1/2-in Female

Bypass: 1/2-in Female

MSRP:

Was:

Price Now:

$336.00
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P.A.

SKU: 041019

P.A. VB 130: 2300 psi @ 6.5 US gpm Unloader Valve

Chemical injector: No

Inlet: 3/8-in Male

Outlet: 3/8-in Male

Bypass: 3/8-in Female

MSRP:

Was:

Price Now:

$47.20

Nozzle Size	Flow	Operating Pressure Range (psi)
Orifice	Flow rate	362	435	507	580	652	725	797	870	942	1015
0.15 mm (0.006″)	L/min	0.03	0.033	0.036	0.038	0.04	0.043	0.045	0.047	0.049	0.05
0.15 mm (0.006″)	US gpm	0.008	0.009	0.009	0.01	0.011	0.011	0.012	0.012	0.013	0.013
0.20 mm (0.008″)	L/min	0.04	0.044	0.048	0.051	0.054	0.057	0.06	0.062	0.065	0.068
0.20 mm (0.008″)	US gpm	0.011	0.012	0.013	0.013	0.014	0.015	0.016	0.017	0.017	0.018
0.30 mm (0.012″)	L/min	0.068	0.075	0.081	0.086	0.091	0.096	0.101	0.105	0.11	0.114
0.30 mm (0.012″)	US gpm	0.018	0.02	0.021	0.023	0.024	0.025	0.027	0.028	0.029	0.03
0.40 mm (0.016″)	L/min	0.104	0.113	0.123	0.131	0.139	0.146	0.154	0.16	0.167	0.173
0.40 mm (0.016″)	US gpm	0.027	0.03	0.032	0.035	0.037	0.039	0.041	0.042	0.044	0.046
0.50 mm (0.020″)	L/min	0.114	0.125	0.135	0.144	0.153	0.161	0.169	0.176	0.183	0.19
0.50 mm (0.020″)	US gpm	0.03	0.033	0.036	0.038	0.04	0.043	0.045	0.047	0.048	0.05
0.60 mm (0.024″)	L/min	0.138	0.152	0.164	0.175	0.186	0.196	0.205	0.215	0.223	0.232
0.60 mm (0.024″)	US gpm	0.037	0.04	0.043	0.046	0.049	0.052	0.054	0.057	0.059	0.061
0.80 mm (0.032″)	L/min	0.165	0.181	0.195	0.209	0.221	0.233	0.245	0.256	0.266	0.276
0.80 mm (0.032″)	US gpm	0.044	0.048	0.052	0.055	0.058	0.062	0.065	0.068	0.07	0.073
1.00 mm (0.040″)	L/min	0.188	0.206	0.222	0.237	0.251	0.264	0.276	0.287	0.298	0.308
1.00 mm (0.040″)	US gpm	0.05	0.054	0.059	0.063	0.067	0.07	0.073	0.076	0.079	0.081
1.20 mm (0.048″)	L/min	0.207	0.227	0.245	0.262	0.278	0.293	0.307	0.32	0.332	0.343
1.20 mm (0.048″)	US gpm	0.054	0.06	0.065	0.069	0.073	0.077	0.081	0.085	0.088	0.091

Orifice	Contour based angle
0.10 / .004″	19.90°
0.15 / .006″	55.70°
0.20 / .008″	72.50°
0.30 / .012″	74.60°
0.40 / .016″	82.00°
0.50 / .020″	72.50°
0.60 / .024″	91.00°
0.80 / .032″	105.80°
1.00 / .040″	106.90°
1.20 / .048″	114.00°

Unloader, Safety & Flow Control Valves

Bolt-On Unloaders

Thread-On Unloaders

Flow Regulators

Safety & Relief Valves

Canpump Unloader Valve - 4000 psi @ 6.6 US gpm, Easy Start

P.A. VS 220: 3200 psi @ 6.3 US gpm Safety/Relief Valve, 2 Inlet Ports

P.A. Pulsar Rv: 4050 psi @ 10 US gpm Unloader Valve w/ Knob

Adjustable Pressure Safety Valve, 5000 psi, 3/8-in Inlet

P.A. VB 350: 5075 psi @ 10.5 US gpm Unloader Valve w/ Knob

Canpump Universal Bypass Kit for 3/8-in Unloader Valve

P.A. VB 80/400: 5800 psi @ 21 US gpm Stainless-Steel Unloader Valve

Mecline VRT100 High Flow: 5075 psi @ 26.4 US gpm Unloader Valve

P.A. VB 85/310: 4050 psi @ 21 US gpm Unloader Valve

Canpump Thermal Relief Valve for Hi-Pressure Triplex Pumps

P.A. VB 53: 7250 psi @ 21 US gpm Stainless-Steel Unloader Valve

P.A. VB 130: 2300 psi @ 6.5 US gpm Unloader Valve

Pressure Washer Nozzle Size

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Flow Rate Calculator

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