1 Ultimo aggiornamento: 20/09/12 VB85/ Pressure regulating valve (Unloader) At gun closure, the waterflow is discharged in bypass reducing the pressure in the system upstream of the valve. Technical manual: E 278 DN G 1/2 F White spring /2 NPT F White spring G 1/2 F Blue spring /2 NPT F Blue spring G 1/2 F White spring with knob /2 NPT F White spring with knob G 1/2 F Blue spring with knob /2 NPT F Blue spring with knob Dynamic seals made up of O-ring and runner in teflon. Optimized internal passages that guarantee reduced pressure loss. Antirotation device of the piston positioned inside the valve and obtained by an hexagonal sector of the piston itself. O-rings of the fittings positioned upstream to the thread : no risk of fittings ejected in case of overpressure. Double feed connection. Version with knob fitted with locknut for minimum working pressure adjustment. TECHNICAL SPECIFICATIONS Construction material Brass body and internal parts in Sst. Rated temperature (1) 90 C 195 F Nominal Size DN 15 PART NUMBER RATED PRESSURE PERMISSIBLE PRESSURE MINIMUM ADJUSTABLE PRESSURE % PRESSURE DECREASE FOR VALVE RESET (2) MAXIMUM FLOW (3) WEIGHT INLET OUTLET BYPASS bar psi bar psi bar psi % l/min USGpm g lbs G 1/2 F /2 NPT F G 1/2 F /2 NPT F G 1/2 F /2 NPT F G 1/2 F /2 NPT F Instruction manual, maintenance, installation, spare parts. n
2 Ultimo aggiornamento: 20/09/12 1) The valve has been designed for a continuous use with water at a temperature of 60 C (140 F). It can work for short periods with water at the maximum temperature of 90 C (195 F). 2) When the valve is in bypass mode, this is the decrease of pressure that has to occur in the circuit downstream of the valve, in order that the valve can restore the working pressure in the system. The indicated figure is expressed as a percentage of the pressure setting (working pressure). 3) If the valve is fed through the lower inlet port, the maximum flow rate is 40 l/min. At gun closure, a pressure increase occurs in the circuit downstream of the valve. This pressure increase is used to activate the valve and discharge all the flow in bypass. The value of the pressure increase cannot be calculated. It depends on the correct setting of the valve (see PRESSURE ADJUSTMENT/SETTING) and on the layout of the system: flow rate, working pressure, length and characteristic of the tubes, closing time of the gun. DIMENSIONAL DRAWING Instruction manual, maintenance, installation, spare parts. n
3 Ultimo aggiornamento: 20/09/12 DESCRIPTION The valve has two inlet ports with Bsp 1/2 F thread (1/2 NPT F). If the valve is fed through the lower inlet port, the maximum flow rate is 40 l/min (10.6 USGpm). The valve has an outlet port with Bsp 1/2 F thread (1/2 NPT F). The valve has also a bypass port with Bsp 1/2 F thread (1/2 NPT F). The valve is available in two different versions: with and without the plastic adjustment Knob. SELECTION This product is intended to be incorporated on a finished machine. This product is to be utilized with clean fresh water, even slightly additivated with normal detergents. For use involving different or corrosive liquids, contact the PA Technical department. Appropriate filtration should be installed when using impure liquids. Choose the valve in line with the working data of the machine where to be installed (permissible pressure, maximum flow rate and rated temperature of the system). In any case, the pressure of the machine must not exceed the permissible pressure imprinted on the valve. OPERATION The valve regulates the pressure of the system by altering the flow discharged by the bypass. The adjustment is carried out by changing, by means of a piston, the position of a ball that partially shuts the bypass opening. At gun closure, a check valve closes and isolates the part of the circuit downstream of the valve: the pressure increase that remains trapped is used to activate the complete opening of bypass. All the flow supplied by the pump is therefore discharged at low pressure through the bypass and the pump works at low pressure. 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, On a system that produces hot water, it is advisable to fit in accessories that limit the accidental increase of fluid temperature. Always install a safety valve. Instruction manual, maintenance, installation, spare parts. n
4 Ultimo aggiornamento: 20/09/12 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 nozze wears out, the working pressure decreases. To reset the pressure back to work level, it is necessary to replace the worn out nozzle. When a new nozzle is fitted, re-setting of the system to its original working pressure is necessary. DISCHARGE SYSTEM AND WATER ADDUCTION The bypass discharge can be sent back to the pump intake or returned into a tank; in such case it is adviseable that the tank be fitted with deflectors to reduce eventual turbolence and air bubbles generated by the immission of the bypass flow which could be harmful for the pump. PRESSURE ADJUSTMENT/CALIBRATION The desired working pressure must be adjusted with the system running and the gun opened. Adjust the pressure by screwing or unscrewing the adjustment screw/knob. The operation is easier if the correct nozzle has been chosen (see paragraph installation ). When screwing the screw/knob a consequent pressure increase must be matched. If, before reaching the desired pressure, there is no pressure increase when screwing the screw/knob, do not insist but check the correct ratio nozzle/flow rate pressure and, if necessary, fit a nozzle with an inferior size. With the knob version it is possible to set up the minimum working pressure with the provided locknut (pos.26). ATTENTION: The nut in position 22 (version without knob) and 22 (version with knob) is a mechanical security device that limits the maximum pressure; it must absolutely not be removed. PROBLEMS AND SOLUTIONS PROBLEMS PROBABLE CAUSES SOLUTIONS Frequent valve recycles Valve does not reach pressure High pressure peaks at gun closure Valve does not discharge at low pressure at gun closure Damaged check valve O-ring Leaking connections Restricted bypass or too small diameter of the bypass hose Piston O-rings worn out Material between seat and shutter Seat worn out Nozzle worn out Incorrect choice of nozzle There is not a min of 5% of total flow discharged in bypass Excessive flow in bypass Adjustment with spring totally compressed Jammed check valve Material matter on check valve Replace Check or renew Clean or adapt passage diameter Replace Clean the seat Replace Replace Fit nozzle with lower size Reset correctly Change type of valve or adjust passages Loosen adjustment screw/knob and eventually fit nozzle with lower size Clean or replace Clean MAINTENANCE STANDARD: every 400 working hours, control and lubricate the seals with water resistant grease. SPECIAL: every 800 working hours, control the wear of the seals and internal parts and if necessary, replace with original PA parts taking care, during installation, to lubricate with water resistant grease. Maintenance has to be carried out by Specialized Technicians. The Manufacturer is not to be considered responsible for damage as a result from incorrect fitting and maintenance. REGULATIONS : see Norm Manual. The accessory hereby described bears the CE marking in accordance with the standards and directives published in the Declaration of conformity. For a correct utilization, follow the directions described in this manual and re-print them on the Use and Maintenance manual of the machine. If needed, ask for the original Conformity Declaration for the chosen accessory. The present manual is valid for all unloader valves named VB 85. Technical data, descriptions and illustrations are indicative and liable to modification without notice. 4
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