US 5,467,683 AGranted

Actuating drive for a control valve

AssigneeABB Management AG

InventorsHeinz Frey, Kamil Prochazka, Franz Suter

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Abstract

This actuating drive (1) for a control valve (2) has a control circuit which sets the actuating drive (1) to correspond with a specified required value from an overriding installation control system. It has, in addition, a main piston (6) sliding in a main cylinder (5) with a drive volume (7), on one side of the main piston (6), which can be acted on in a controlled manner by oil under pressure and has a plate valve (17) fitted upstream of the drive volume (7). The intention is to create an actuating drive, for a control valve, whose dynamic behavior can be improved by relatively simple means. This is achieved by the plate valve (17) being provided with a separate reservoir volume, connected to a drain appliance, for the oil emerging from the plate valve (17).

Claims4

Dependent claims

An actuating drive for a control valve, the control valve having a control circuit for setting the actuating drive to correspond with a specified required value from an overriding installation control system, the actuating drive comprising:

a main cylinder;
a main piston slidably disposed in the main cylinder, the main piston and the main cylinder defining a drive volume on a first side of the main piston, and a buffer volume on a second side of the main piston, the buffer volume being connected with a drain appliance;
a plate valve fitted upstream of the drive volume, the plate valve being arranged in a spatially separate manner from the drive volume and being connected to the drive volume by a connecting conduit, the plate valve having a reservoir volume, the reservoir volume including a first volume and an intermediate volume connected directly to the drain appliance,
wherein pressurized fluid causes the main piston to slide in the main cylinder.

1 more element

Dependencies are inferred from the claim text.