SPEED GOVERNORS

REPAIR, MAINTENANCE, TESTING, CALIBRATION AND INSPECTION OF SPEED GOVERNORS

Our specialists at Sirtec, based in Genoa, deal with everything related to speed governors, from maintenance at our workshop to installation on the engine, serving customers in Italy and abroad. At Sirtec, we guarantee punctual repair, maintenance, inspection and calibration services of mechanical, hydraulic and electronic speed governors for diesel and gas engines and turbines for both marine and land-based systems. At Sirtec, thanks to our extensive experience and collaboration with the most important brands in the sector, we can guarantee the best range of products, offering speed governors from our business partner, Woodward, Regulateurs Europa, which we serve as a Service Centre, in addition to Diesel Kiki, Daihatsu, Zexel and other brands. Our Sirtec technicians can assist with any installation intervention that is necessary onboard the machine.

SUPPLY OF NEW AND RECONDITIONED SPEED GOVERNORS

At Sirtec, we can supply new and reconditioned speed governors that guarantee equivalent performance at a significantly lower cost.

ORIGINAL SPARE PARTS FOR SPEED GOVERNORS

Our staff at Sirtec solves emergencies promptly, thanks to our ample stock of original spare parts from the major brands, such as Woodward, Regolateurs Europa, Daihatsu, Zexel, and others.

SPEED GOVERNORS AND OVERSPEED SYSTEMS TEST BENCH

Sirtec possesses the latest-generation equipment, such as test benches used to test and calibrate the speed governors, as well as for operational testing. We also have a calibration bench capable of testing overspeed governors.

The servicing phases that a governor undergoes

SPEED AND OVERSPEED GOVERNOR, WHAT IS IT AND HOW DOES IT WORK?

Prime movers are equipped with an overspeed or safety governor, which is activated when, for any reason, the engine rotation speed exceeds the established maximum limit. This occurs when the moment of resistance is abruptly reduced, for example, due to the emergence of the propeller in the case of a propulsion engine, or the electric load failing in a generation engine. In such conditions, if the quantity of fuel injected into the cylinders is kept unaltered, the engine would tend to precipitate, considerably increasing its speed, functioning in an irregular manner and causing a significant increase in the inertial force which, if not controlled, can cause serious damage to the engine.
In normal operating conditions, the engine, whether propulsion or generation, will be maintained at the expected speed through the speed governor according to a forecast rotational speed condition, a possible increase in the speed of rotation would immediately meet a greater or lesser resistance on the part of the load (propeller or electric) and will tend to bring the speed back to its rotational speed unless a corresponding increase or decrease of the engine moment occurs. The speed governor, which is substantially outside the insensitivity range to which it has been calibrated, intervenes at each variation of the moment of resistance to maintain the dynamic equilibrium by controlling the fuel supply system. For power generators which must supply a constant voltage line, the speed governor keeps the number of revolutions practically constant; for alternating current generators, moreover, the rotation speed must be kept constant also concerning the frequency which is strictly linked to the number of revolutions.

Both the overspeed governor and the speed governor are modelled on Watt’s governor.

The centrifugal governor is a mechanical device that generates a feedback chain through a sensor that provides an angular-velocity based parameter. This parameter can be a mechanical displacement that acts in negative or positive feedback on a supply regulating valve of an engine to keep the speed constant.

It consists of two or more masses spun by a rotating shaft. Due to the centrifugal force, the masses tend to move away or approach the axis of rotation. The distancing or approaching movement is contrasted by a system of springs through an articulated system, as in the case of Watt’s pendulum.

A system of levers transforms the radial displacement of the masses into the axial sliding of a collar. A lever picks up this latter displacement to transfer it to the body to be controlled, which may be a valve for controlling fuel, steam or water in a forced line. If the speed increases, the masses tend to rise and, through the system of levers, they reduce the power of the engine by reducing its power supply. If it decreases, the masses tend to descend and, through the system of levers, they will increase the power of the engine by increasing its power supply. In this way, an automatic mechanical control is carried out, the purpose of which is to maintain the engine at a constant speed.

James Watt designed his first governor in 1788, following a suggestion from his business partner Matthew Boulton. It was a pendulum bearing two masses suspended by two articulated arms.

Therefore, the speed governor, as its name already suggests, serves to govern the engine speed both at idle and at maximum states and performs three fundamental functions: keeping the engine speed correct and constant according to the position of the rack.

 

We carry out maintenance, calibration and assistance for the following types of speed governors:

R

mechanical / hydraulic governor with centrifugal masses

R

electronic governor

SIRTEC s.r.l.
via Borzoli, 39/122U
16153 GENOVA (GE) – ITALY

phone. +39 010 6503836
fax. +39 010 6505609
info@sirtecsrl.com

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