Biffi actuator maintenance manual

A bronze split screw nut is mounted inside the body. By rotating the engagement lever, the screw nut is engaged with the jackscrew. When the screw nut is engaged with the jackscrew manual operation follows by rotating the body of the screw container by a lever for MSJ models or by a handwheel for MHW models. Figure 9A The MHP hydraulic manual override is used to manually operate the actuator in lack of air supply. It also allows to accurately adjust the actuator operating times, independently in opening and in closing, by way of the hydraulic regulators which work on the oil flow from one chamber to the other of the hydraulic cylinder during pneumatic operation.

Moreover it permits a smooth angular speed all along the stroke. During manual operation the flow regulators are by-passed to make the force on the hand pump lever easy. The MHP unit consists of a hydraulic cylinder mounted directly on the actuator. The piston rod end is screwed into the guide block. The compact hydraulic control unit consists of a hand pump, directional control valve, oil tank, relief valve and two unidirectional flow regulators.

The directional control valve has three operating positions: 'remote': the actuator is operated by pneumatic supply; 'to open': the actuator operation is opening by hand pump. On request the hydraulic manual override type MHP2 double hand pump version can be supplied, which allows the remote control to automatically override manual operation.

The flow regulator Fa allows control of the stroke time. Figure 10B - Manual operation The diagram is drawn with actuator under manual operation towards open. The operation to be performed is selected by the directional control valve D. The actuator has parts under pressure. Use the due caution. Use individual protections provided for by the laws and provisions in force.

Figure 12 - Actuator with two cylinders 10 Biffi ALGA double acting pneumatic actuator Installation, Operation and Maintenance Manual For the adjustment of the travel stop screws proceed as follows see figures 13A, 13B : 1 Loosen the lock nut 2 with a proper wrench c2.

When unscrewing the stop screw, keep the lock nut still with a wrench so that the sealing washer 3 does not withdraw together with the screw. Actuator model 0,3 0,9 1,5 3 6 Wrench c1 mm 30 30 41 41 Wrench c2 mm 30 30 41 41 46 46 Figure 14A - Mechanical stop on the housing.

Actuator model 14 18 32 50 Wrench c1 mm 17 17 17 17 Wrench c2 mm 60 60 60 60 Figure 14B - Mechanical stop on the housing. Figure 17 - Mechanical stop on the end flange of manual override. Hydraulic cylinder size Wrench c1 Wrench c2 Wrench c3 mm mm mm 22 10 36 22 10 36 22 10 36 22 14 46 27 27 27 36 14 17 17 17 46 65 65 Figure 18 - Mechanical stop of the MHP cylinder.

Warning If microswitches assembly or limit switch box is supplied, please refer to the specific technical documentation. Important Operate only the microswitch corresponding to the direction of operation being carried out, as clearly reported on the microswitch. Important End of stroke microswitches should be operated before the stop of the stroke of the actuator due to mechanical stops.

Adjust the relative cams properly. Warning Do not open when energized or when an explosive atmosphere is present.

Warning Electrostatic hazard, clean only with damp cloth. For applications that require position feed back, ancillary components such as a mA current signal transmitter or a resistive signal feed back can be installed. To allow this product to be used with network communication bus protocols, the series enclosure can house various network modules. The series enclosure comprises of a two parts, a cover and housing.

The cover has three variations, flat cover, standard beacon cover or a high cover to suit different applications. The housing can offer up to two integral solenoid coils and upto three of the following conduit entries; M20 x 1. Note: Before installation of this product, please ensure that the product and its certification is suitable for the intended application. If the equipment is likely to come into contact with aggressive substances, then it is the responsibility of the user to take suitable precautions that prevent it from being adversely affected, thus ensuring that the type of protection provided by the equipment is not compromised.

Installation of any cable entry devices, conduit entry devices or blanking devices shall not compromise the degree of ingress protection level IP6X for use in the presence of combustible dusts. Ensure that this is taken into consideration when selecting suitable cabling for the ambient temperature in which the product is to be used. Note: These products are not intended to be assembled directly to process pipe work etc that is heated or cooled to temperatures outside of the range as indicated above.

Warning Before stroking the actuator to the fully closed position, please ensure that the process is safe to do so. These entries are detailed on the product I.

D label found on the product cover. Please see figure 21 for conduit positions. See figure The spring will push the cam back onto the splined shaft.

Set the top cam by pushing down and turning the cam until the switch is activated. Warning Before stroking the actuator, please ensure that the process is safe to do so and that all hands are kept away from the moving shaft. If the switches require adjustment, repeat steps 5 to 7.

Note: Before electrical installation, please read and follow the wiring diagram located inside the cover. The electrical ratings can be found on the product I. D label. This includes special attention to earth bond to the aluminium enclosure using the internal and external earth points provided. See I. M TECH With the Netpak options it may be possible to assemble other switches within the enclosure depending on enclosure cover variation.

The series enclosure is available in two materials; cast aluminium or stainless steel. The enclosure construction comprises of a housing with a screwed cover. The housing has the option of upto three cable entries for connection to an external power source via appropriate ATEX certified cable glands: M20 x 1.

Loosen the beacon fixing screw, see figures 22 and 23, rotate beacon window outer beacon to indicate appropriate open or closed text as corresponding to actuator position. Ensure that the Jack screw M4 socket head cap screw remains in the housing Fig.

The spring will push the cam back onto the splined shaft Fig. Please see figure 25 for conduit positions. Screw the cover onto the housing ensuring that it is not cross threaded and turns freely. Continue tightening the cover until metal to metal condition is achieved between the bottom edge of the cover and the housing surface.

The series valve position monitor provides end of travel indication by the means of either electrical switch or inductive sensors mounted within the enclosure. These are activated by cams mounted on the rotary shaft. The series enclosure construction comprises of a shaft passing through the enclosure base and cover when fitted with visual beacon. The two part enclosure has an integral gasket seal. This product is available in three materials, Zytel resin, aluminium or stainless steel The housing has the option of up to three cable entries dependant on enclosure material for connection to an external power source via appropriate ATEX certified cable glands; M20 x 1.

If the equipment is likely to come into contact with aggressive substances, then it is the responsibility of the user to take suitable precautions that prevent it from being adversely affected, thus ensuring that the type of Warning Before stroking the actuator, please ensure that the process is safe to do so and that all hands are kept away from the moving shaft.

See figure 26 below. This includes special attention to earth bond to the aluminium or stainless steel enclosure using the internal and external earth points provided. If the CS or RS transmitter is used in conjunction with any switches, sensors or solenoids then the max surface temp for gas and dust shall be shown on the label.

For ALGA actuator models with manual hand pump MHP , the operating time is adjustable through two regulation valves placed on manual hand pump body see par.

Pneumatic connection Pneumatic connection close screw for decrease speed Wrench The calibration of the operating time is made by Biffi Italia S. Screwdriver open unscrew for increase speed of operation Figure 28 - Example of operating time adjustment if foreseen.

Operational tests and inspections Important To ensure the guaranteed SIL Level, according to IEC , the functionality of actuator must be checked with regular intervals of time, as described following. For safety related applications, the following test operation has to be performed: 1 Full stroke of actuator once a year. For standard applications please refer to paragraph 5. Maintenance Important Before executing any maintenance operation, it is necessary to close the pneumatic supply line and discharge pressure from the cylinder of the actuator and from the control unit if foreseen.

Important Periodicity and regularity of inspections is particularly influenced by specific environmental and working conditions. They can be initially determined experimentally and then be improved according to actual maintenance conditions and needs. If the actuator operation is very infrequent, carry out a few opening and closing operations with all the existing controls remote control, local control, emergency controls, etc. Minimum level Figure 29 - Level measuring stick.

If necessary substitute the gaskets 21 of the tank. During the routine maintenance it is recommended to check and clean the mechanical filter and replace it in case of heavy dirty conditions. To disassemble the filter proceed as follow: a close the stop valve at the inlet of pressure supply line; b discharge the pressure from the drain valve; c Remove the lover enclosure screws, d remove the mechanical filter; e clean or replace the filter; Reinstall all parts carefully paying attention to avoid any damage to the O-ring.

If the actuator can be operated, it is essential to take it to fail safe position, otherwise the actuator should be disassembled from the valve and follow these steps: 24 Biffi ALGA double acting pneumatic actuator Installation, Operation and Maintenance Manual Seals replacement Prior to reassemble check that the actuator components are in good conditions and clean.

If the O-ring must be replaced, remove the existing one from its groove, clean the groove carefully and lubricate it with protective oil film. Assemble the new O-ring into its groove and lubricate it with a protective oil film. Replace the O-ring 40 of the end flange If the sealing washer 43 has to be replaced, measure the protrusion of the stop screw 26 with reference to the end flange 22 surface, so as to be able to easily restore the setting of the actuator mechanical stop in the closed valve position, once the maintenance procedures have been completed.

Carefully clean and lubricate the stop screw thread and the surface of the end flange area, on which the sealing washer works. Lubricate the inside surface of the tube and the bevels at the ends. Slide the tube onto the piston taking care not to damage the piston O-ring 42 and the head flange O-ring Tighten the nuts to the recommended torque, alternating between opposite corners. Tighten the screws to the recommended torque. Important After maintenance operations carry out a few actuator operations to check that its movement is regular and that there is no air leakage through the seals.

Reassemble 1 Assemble the new gasket 36 after cleaning the surfaces of housing 8 and head flange 17 , which are in contact. All rights reserved. The contents of this publication are presented for information purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the p … The information in this document is subject to change without notice.

Updated data sheets can be obtained from our website www. WARNING Before executing any maintenance operation, it is necessary to intercept the hydraulic supply line and discharge pressure from the cylinder of the actuator. If it is possible to operate the actuator, it is essential to take it to the idle position, with the spring completely extended, otherwise … Insert a wrench for Allen keys c2 in the through … In case of high load and high frequency of operation it may be necessary to periodically restore lubrication: it is advisable to apply a generous coating of grease on the contact surfaces of the yoke and bushings, on the yoke link grooves, on the sliding blocks, on the guide bar.

For this operation it is necessary to disassemble the mechanism cover. In larger actuators the … Before carrying out any operation, cut line power off. A non-conforming assembly could be the source of serious accidents.

Parts List Figure 29 Assembly Kit …