Spec Sheet
INSTRUCTIONS
YVB4021HT
GENERAL PUMP A member of the Interpump Group
SELECTION
This product is to be used with clean water which can contain the addition of normal detergents. For use involving different or
corrosive liquids, contact the General Pump Customer Service Department. Appropriate filtration should be installed when using water
that may contain any sort of debris. Choose the valve appropriate for the system rated pressure, maximum flow rate and maximum
temperature. In any case, the pressure of the machine should not exceed the permissible pressure rate imprinted on the valve.
INSTALLATION
On a system that produces hot water, this accessory must be fitted upstream of the heat generator. On a system that generates hot
water, it is advisable to fit in accessories that limit the accidental increase of fluid temperature.
ALWAYS INSTALL A SAFETY VALVE
It is recommended to use a nozzle with a size that, at gun opened, allows to discharge from the valve bypass at least 5% of the flow
supplied by the pump in order to obtain a constant pressure value, and an easy adjustment and to avoid troublesome pressure spikes
at gun closure.
If the nozzle wears out, the working pressure decreases. To reset the pressure back to work level, it is necessary to replace the worn
nozzle. When a new nozzle is fitted, re-setting of the system to its original working pressure is necessary.
PARTS LIST
Ref 300981 Rev. B
10-18
Pressure Trapping Unloader
No. Part No. Description Qty.
1* Y10306601 O-ring, 1.78 x 15.6 1
2* Y60180951 Seat, 11.6 x 19 x 6, SST 1
3* Y60180851 Shutter Pin, M8, SST 1
4 Y60182231 Spacer Ring, Brass 1
5* Y10401075 Stem Seal 1
6* Y10317175 O-ring 1
7 Y60182331 Piston Holder, Brass 1
8 Y60172831 Ring Nut, M27 x 1, Brass 1
9 Y16210000 Set Screw, M4 x 4 1
10* Y10307201 O-ring, 1.78 x 20.35 1
11* Y10306801 O-ring, 1.78 x 17.17 1
12 Y60185135 Brass Body, 1/2” NPT 1
13* Y10329285 O-ring 1
No. Part No. Description Qty.
14 Y60048831 Shutter Pin, Brass & O-ring 1
15 Y60048951 Spring, 0.8 x 13.3 x 27, SST 1
16 Y60185231 Shutter Coupling, 1/2F, NPT, Brass 1
17* Y10307260 O-ring, 1.78 x 21.95 1
18 Y60172684 Valve Regulating Knob 1
19 Y60172731 Valve Regulating Insert, Brass 1
20 Y60097561 Spring, 4.5 x 15.8 x 47 1
21 Y60181331 Spring Rest Pin, Brass 1
22 Y14744310 Ball, 11/32”, SST 1
23 Y60182151 Piston, M8, SST 1
24* Y10400875 Piston Seal 1
25* Y10317175 O-ring 1
* YKIT4021HT Repair Kit