DE4331720A1 - Piston differential pressure meter for monitoring filter installations - Google Patents

Abstract

In this measuring device, the scale is located on the movable piston, the measurement results being read out via an external vernier without parallax errors. The drag piston (4) shows the maximum differential pressure and remains in the maximum position. The precise registration of the measurement results gives a reliable conclusion as to the contamination of the filter installations, in particular the monitoring of the maximum differential pressure using the drag piston is indicated, so that the penetration of dirt during economical long-term use is prevented. Main fields of application of the invention: transhipment of mineral oil, hydraulic installations, lubrication and coolant installations, breweries and waterworks.

Description

The invention relates to a piston differential pressure meter with a drag piston for the Monitoring of filter systems, the piston with check valve is located on one Tension spring in a glass cylinder, where the differential pressure is directly on the scale on the piston and is read on an external visor.

It is a device for the precise determination of differential pressures as Piston differential pressure meter known: Patent DE 24 05 826 C2. With this device for the precise determination of differential pressures, the measurement result is displayed on an external scale. There are incorrect readings in this reading procedure occurred.

In addition, the max. Differential pressure is only determined by constantly reading the measured values could be.

The invention seeks to remedy this. The invention as characterized in the claims is the task of directly reading the measured values on the scale, which is on the Movable pistons are located, which over the outside visor without parallax errors Measurement results can be read, in addition, the max. Differential pressure by a trailing piston displayed.

The advantages achieved by the invention can be seen essentially in the fact that the measuring results directly on the movable piston and over the sighting device much better can be read. With the fixed visor and the scale on the movable piston remains the posture for reading the measured values is always at the same level.

Due to the trailing piston, the max. Differential pressure displayed, therefore there is no constant reading of the measurement results.

In addition, there are other advantages with the combination circuit of the connections A-B-C-D available.

1. Return trailing piston, 2. Product renewal in the piston differential pressure meter and their Pipelines, 3rd venting, 4th test function free movement of the piston.

The invention is explained in more detail below on the basis of an embodiment with the drawing shown: FIG. 1 shows the glass cylinder 1 and the piston 2 with the scale 10 attached to them, as well as the tension spring with threaded suspension 3 , which can only be seen in the upper area of the drawing , whereby the lower tension spring fastening on the piston head is identical to the upper thread suspension.

According to the invention, the trailing piston 4 has a smaller diameter than the inner diameter of the glass cylinder 1 and is held centrally in the glass cylinder with steel balls 5 and compression springs 6 , thus the trailing piston 4 with the piston 2 , on which the scale 10 is located, is shown in a differential pressure display below for max. Display area carried. If no differential pressure is present, the plunger 2 is associated with the scale 10 by the spring force back to its zero position, while the product flows through the large Schleppkolbenpassung so that the drag piston 4 by its frictional resistance of the balls 5 in its max. Position remains. The trailing piston 4 is reset via the combination circuit A and D to, B and C, the check valve 11 is opened and the product flows back into the tank via a disposal line.

According to the invention, the scale 10 is located on the movable piston 2 with a check valve 11 , the drag piston 5 having a smaller diameter than the piston 2 with a scale 10 .

Fig. 2 shows a perspective view of a portion of the transparent housing cover 9 , where a visor 7 and a visor 8 is present on the back. To read the measured values, the two visors are brought into line with the eye, so the measurement results are read on the scale 10 without parallel axis errors.

According to the invention, the transparent housing cover is provided on both sides with a visor which is adjusted to the zero position of the scale 10 .

Claims (1)

Piston differential pressure gauge for the monitoring of filter systems for the determination of differential pressures with a glass cylinder, in which a piston moves hanging from a spring, and a scale, which is located on the piston, characterized by the following features:

• a) on the piston ( 2 ) is the scale ( 10 ) and forms a unit with the check valve ( 11 ),
• b) the drag piston ( 4 ) has a smaller diameter than the piston ( 2 ), with the balls ( 5 ) and springs ( 6 ) the drag piston is held centrally in the glass cylinder ( 1 ),
• c) the transparent housing cover ( 9 ) is provided on the front with a visor ( 7 ) and on the back with a visor ( 8 ), which enables the scale ( 10 ) to be read without parallel axis errors,
• d) the combination circuit with the connections CD is connected to the disposal line ( 12 ) to the tank, which ensures environmentally friendly product return.