Category

 

TECHNICAL SPECIFICATION
Max.  Pressure
:
390 bar - 5650 psi
Flow Rate       
:
40 l/min - 10,5 USGpm
Temperature
:
90 °C - 195 °F
Weight
:
880 gram

 

This is the main safety component of a high pressure cleaning system where trigger operated gun is being used. It along with the trigger gun literally controls the traffic flow of water in the system. Without an unloader valve when gun is shut off, the pressure will continue to rise until either the motor - engine stalls or pump, hose or gun ruptures. Unloader divert all or part of the flow to a supply tank or the inlet of pump (should not connect without manufacturers’ permission) to prevent pressure from building up. When gun is opened water moves from outlet of pump through hose to gun and nozzle. When trigger is released the valve closes and the unloader is activated either by an increase in pressure (pressure actuated type) or a reduction in flow (flow actuated type). Water flows into channel and pushes piston down which opens bypass valve. The unloader diverts flow of water from outlet side of pump back to inlet side causing water to flow back to pump virtually under no pressure.

Advantages of flow actuated unloader is that hose and pump pressure is reduced in unload mode. This is safer for hot water coil and when operator does not want fast kick back when gun trigger is depressed. It however, cannot be used on multi gun systems and is generally more expensive and sensitive to adjust.

Pressure actuated type is the common. It traps pressure in hose during unload mode so immediate pressure is available when gun is opened.

Pressure of system can be controlled to some extend by adjusting the tension on the spring holding the piston in the valve in place. Changing nozzle is preferred method of controlling pressure and unloader should only be adjusted to fine tune the system.

If unloader valve goes on/off when gun is shut off either the spring is not properly adjusted or there is a leak in hose, gun or connections. Too tight a spring tension can create a safety problem due to high-pressure spikes before it unloads. Sleight bypass of liquid prevents valve erosion.












Part Listing:

Sr.NoItem NameItem CodeQty Price (INR) Weight (KG) Desc.
1 Shutter coupling 3/8F Bsp brass 60.1811.31 1 1,236.00 0.060 View
2 O-ring, 1,78x15,6mm Ni 85 (G/H/L/N) 10.3066.01 (Inclusive in spare kit) 10.3066.01 2 108.00 0.001 View
3 Spring,0,7x9x20mm 60.0053.51 60.0053.51 1 48.00 0.001 View
4 Shutter pin, sst. +or 3x6 mm Ni 90 60.9052.93 60.9052.93 1 1,140.00 0.001 View
5 O-ring,3x6mm Ni 90 (Inclusive in spare kit) 10.3213.08 1 108.00 0.001 View
6 Housing V280-350/4,3/8M c/snk+1/4F Bsp brs 60.1725.35 1 6,318.00 0.450 View
7 Seat, 11,6x19x6 mm Sst. (L/N) 60.1809.51 (Inclusive in spare kit) 60.1809.51 1 588.00 0.001 View
8 Shutter pin, M8 Sst. 60.1808.51 (Inclusive in spare kit) 60.1808.51 1 1,872.00 0.010 View
9 O-ring, 1,78x17,17 mm ni 85 (A/D/E/L/N) 10.3068.01 (Inclusive in spare kit) 10.3068.01 1 108.00 0.001 View
10 Spacer ring, 10,3X23,4X12,5 mm 60.1810.31 60.1810.31 1 804.00 0.030 View
11 Stem seal, 10x14,9x2,2 mm+o-ring 60.0979.24 (Inclusive in spare kit) 60.0979.24 1 420.00 0.001 View
12 O-ring, 1,78x20,35mm ni 85 (A/D/E/K/L/M/N) 10.3072.01 (Inclusive in spare kit) 10.3072.01 1 108.00 0.001 View
13 Piston holder 60.1805.31 60.1805.31 1 3,024.00 0.150 View
14 Set screw, DIN914 M 4x4 mm 16.2100.00 16.2100.00 1 96.00 0.001 View
15 Ring nut, M27x1 brass 60.1728.31 60.1728.31 1 552.00 0.030 View
16 Piston seal9x14x2,2 mm +o-ring (Inclusive in spare kit) 60.0978.24 1 432.00 0.001 View
17 Piston, M8 Sst. 60.1806.51 60.1806.51 1 1,440.00 0.020 View
18 Ball, 11/32" Sst. (F/I/L) (Inclusive in spare kit) 14.7443.10 14.7443.10 1 264.00 0.010 View
19 Spring rest pin 60.1813.31 60.1813.31 1 216.00 0.010 View
20 Spring, 4,5X15,8X47 mm 60.1812.61 60.1812.61 1 540.00 0.040 View
21 Valve regulating insert 60.1727.31 60.1727.31 1 1,440.00 0.050 View
22 Valve regulating knob, PA red 60.1729.84 60.1729.84 1 372.00 0.010 View
23 Spares kit-VB350 with knob unlaoder valve (1 kit for each unloader valve) 60.1615.24 1 3,102.00 0.120 View




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