SERIE PROCESS HYDRAULIC DIAPHRAGM …

1 JOB NoCUSTOMERCUSTOMER ORDERNoPUMP TYPEENCLOSESITEMSERIAL(S) NoOPERATING MANUALPPOOSSIITTIIVVEE RREETTUURRNNSERIELPROCESS HYDRAULICDIAPHRAGM METERINGPUMPSII ssssuuee 22000055 HYDRAULIC CIRCUIT WITH BUILT-IN RELIEF VALVE ANDMECHANICALLY ACTUATED REPLENISHING VALVEXX99 VVEERRSSIIOONNDoc. N Doc. D'ADDIOSost. generale, monolinguaSERRAINO05/08 - general characteristics of the - flow - to manual adjustment of the - to manual adjustment of the capacity bymeans of gravitational - installation of the - - suction - suction side - suction piping for viscous - - installation of pulsation - safety - installation of the pressure gauge112 INSTALLATION OF - to fill pump casing with - fixing of the pump133 START - pump - routine maintenance.

2 Check valves LY - LK- LN - - replacement DIAPHRAGM & filling oil - LY - LK - LN-LP - preventive - metering pumps type LP-LN knobadjustment friction - operating - Lubricant table24 General safety norms265 MACHINERYDIRECTIVECE conformity declaration27 OVERALL DRAWINGDWG. No. _____ REV. ___SECTIONAL DRAWINGDWG. No. _____ REV. ___ENCLOSESDIAPHRAGM RUPTUREDETECTORDWG. No. _____ REV. ___GENERAL - GENERAL CHARACTERISTICS OF THE METERINGS PUMPSM etering pumps are controlled-volume reciprocating pumps. The reciprocating motion generates a sinu-soidal delivery of the flow, the flow of the pumped product is of pulsating nature, not OF METERING PUMPS: The basic types of metering pumps are: Plunger pumps:the PROCESS fluid is in direct contact with the plun-ger and its packing.

3 The plunger sucks the pro-cess fluid into the pump head (suction stage )and then discharges it through the pump head di-scharge valve (compression stage) (picture 1). Mechanical DIAPHRAGM pumps:the PROCESS fluid is in direct contact with adiaphragm and isolated from the pump s thrustmechanism. The mech is not supported by ahydraulic fluid and therefore bears directly thethrust generated by the PROCESS fluid mechanical DIAPHRAGM carries out the suc-tion and compression stages, its motion tran-smitted by the pump thrust mechanism is axial(picture 2).

4 HYDRAULIC DIAPHRAGM pumps:The pumped product is in contact with a DIAPHRAGM andisolated from the pump thrust mechanism. The hydrau-lic DIAPHRAGM is placed between two liquids (processproduct and HYDRAULIC oil) and is subject to compressionon its thickness only. The HYDRAULIC system (behind thediaphragm) transmits the volume displaced by a reci-procating piston causing a regular flexure of thediaphragm resulting in a spherical segment whose vo-lume corresponds to the volume displaced by the pi-ston. Suction and compression stages are carried outby the piston.

5 The HYDRAULIC system of all HYDRAULIC - DIAPHRAGM metering pumps is of the intelligentdiaphragm type, also called mechanical oil replenish-ment . Besides the safety valve, this system isprovided with air bleed valve and mechanicallyoperated oil replenishing valve (picture 3).Picture 1 Picture 2 Picture 3 GENERAL - FLOW RATEThe reciprocating motion of the metering pump is converted into flow thanks to the inlet and outlet checkvalves of the pump head(picture 4). During the suction stage the inlet valve opens because of the vacuum created by the piston (or by themechanical DIAPHRAGM ) while the outlet valve remains closed.

6 The product enters the pump head andgoes out throught the outlet valve when pushed by the piston during thecompression stage. Theoretical flow rateThe theoretical flow rate corresponds exactly to the volume displaced by the piston during its graphic representation is a diagonal straight line whose progression is determined by the pistonstroke (picture 5). Actual flow rateThe actual flow rate is inevitably less than the theoretical flow rate because of the losses due to thereaction time of the valves. The ratio between these two flow rates determines the volumetric efficien-cy of the pump.

7 The efficiency depends on pump size, pump head type (plunger or DIAPHRAGM ), liquidto be pumped, viscosity of the liquid, working pressure, etc. (picture 6). - MANUAL ADJUSTMENT OF THE CAPACITYThe adjustment of the piston stroke is stepless and regular, and can be carried out at any time, whenthe pump stands still or is running. However, the adjustment is easier when the pump is running, speciallyin the case of models with large-size pistons. The capacity is adjusted by turning the specific knob. Re-gulation range: linear indexing from 0 to 10 (picture 7).

8 The lower edge of the adjustment knob establishes the reference with the piston are as percentage of the total piston 5 Picture 6 Picture 4 GENERAL - TO MANUAL ADJUSTMENT OF THE CAPACITY BY MEANS OFGRAVITATIONAL CLOCKThe adjustment of the capacity is stepless and regular and can be carried out either when the pump is at restor in operation. The gravitational clock enables a clear, exact and quick readout. The dial has a scale from 0to turn of the handwheel corresponds to 1% increase of the capacity. (picture 8)Picture 7 Picture 8 INSTALLATION OF THE - INSTALLATION OF THE PUMPP rovide adequate clearance areas and safe access for operation and maintenance, in particular in front ofthe HYDRAULIC side and of the adjustment knob (picture 9).

9 If the pump is installed outdoors, a shelter isrecommended, specially when the pump is equipped withcontrols or other delicate adequate drains on the discharge piping, close to thepump head, so as to make the disconnection of the pumpfrom the plant easier. When the pumps are provided withvertical axis flanges, fit also a removable joint so as to faci-litate the disconnection of the pump (picture 10).PVC pump heads can work properly only at ambient tempe-ratures and metered liquid temperatures lower than 40 necessary, provide suitable protection from sun rays andcheck the temperature of the metered liquid.

10 Ceramic pi-stons cannot be used for pumping temperatures above80 - SUCTION:Metering pumps can operate with suction lift. However, it isadvisable to set the pump inder head in order to improve me-tering accuracy and volumetric efficiency, and to make startingeasier. The under head setting is practically a necessitywhen the vapour pressure of the liquid is very high. Followingcondition is essential for a good performance of the pump:NPSH plant > NPSH pumps(NPSH = net positive suction head).To get a good metering accurancy, it is necessary that thepumps have an NPSH of more than 4 m, an absolute suc-tion pressure of 4 NPSH of the plant is obtained from the formula:NPSH = PtTvPcPb where:Pb = barometric pressurePc = pressure of liquid column, positive (+) or negative (-) = density of the liquidTv = vapour pressure of the liquidPt = head losses in the suction you are designing a plant, consideration should be gi-ven to the following factors:- a metering pump is a displacement pump.