Vermes MDS 358X user Manual.pdf - 第51页

Micro disp en sing Va lve 40 VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries The valv e body (1) accom mo dates t he electronics m odule, t he act uator sy stem, t he adjust screw and th e tappet (not visible i n …

Microdispensing Valve

VTK-TR-BA-072e-1 - User Manual MDS 358X Series

5 Microdispensing Valve

This chapter contains relevant information about the valve. It describes the structure and the

hardware configuration.

5.1 Composition

The Microdispensing valves of Vermes Microdispensing are modular. A valve is composed of

seven different modules:

• Valve body (includes Electronics module and Actuator system) (1)

• Tappet (not visible) (2)

• Tappet sealing (not visible) (3)

• Nozzle insert (not visible) (4)

• Nozzle fixation nut (5)

• Heater MDH-48-BY with fluid box (6)

• Media supply (7)

Fig. 18: Composition

Microdispensing Valve

VTK-TR-BA-072e-1 - User Manual MDS 358X Series

The valve body (1) accommodates the electronics module, the actuator system, the adjust screw

and the tappet (not visible in the picture). The electronics module holds the electronics to receive

the actuator and sensor signals. Here are the connectors for sensor cable and actuator cable

integrated in the surface of the case; they have to be linked to the control unit. The electronics

module is connected to the actuator system, representing the core of the microdispensing valve.

The actuator system houses the sensor, the piezoelectric element and the mechanics to drive the

tappet. Actuator case and mechanics are sealed for protection against dust and contamination.

The adjust screw (8) is at the top end of the valve body.

At the bottom of the valve is the inlet where the tappet (2) runs. The tappet can be exchanged.

medium and presses it through the opening of the nozzle insert. Tappets can be made of

ceramics, of carbide metal or of poly diamond. They can have different forms or sizes. A tappet

should be checked and cleaned regularly or exchanged if necessary (see paragraph 10.2.1

"Maintenance of the Tappet", page 138).

The connection between valve body and fluid box is made up of the tappet sealing (3). There are

different types of tappet sealings, e.g. the Tappet Sealings PE and Tappet Sealings PTFE, which

have to be used together with a tappet centering piece.

A small but important module is the nozzle insert (4), which has to be considered as a wearing

part. Thanks to the bayonet fluid box, it can easily be cleaned and exchanged in case of need.

VERMES Microdispensing offers a large selection of different nozzle inserts to allow for optimum

dispensing results, according to the current application. They can differ in form and material.

The nozzle fixation nut (5) contains the nozzle insert (NI).

The fluid box (6) is integrated into the heater MDH-48-BY. It is thermally isolated from the

actuator system. Its purpose is to transport the liquid from the cartridge or the tank to the nozzle

fixation nut. In order to simplify independent cleaning, this module can easily be disengaged

from the valve, just by one click, thanks to the bayonet system. Information how to assemble a

fluid box you can find in paragraph 6.2, page 45. In case you need no heating for your

application, you can use the Mounting Body BY (order no. 1014369) instead of the heater MDH-

48-BY.

The media supply (7) supplies the dispensing medium and is connected with the fluid box.

VERMES Microdispensing GmbH has many different configurations available (see Page 158). For

smaller amounts to be dispensed you can use a cartridge. They come in different sizes and types.

For larger amounts, you can use a tube connector to connect a pressure tank with the fluid box.

Microdispensing Valve

VTK-TR-BA-072e-1 - User Manual MDS 358X Series

5.2 Explosion View Valve

The explosion view of an MDV 3580. Usually the cable connections point upwards, but on

request, they can be oriented differently, so that the cables point to the side. You can change the

orientation of the compressed air connections according to your needs. To do so, you will need a

hexagon key, size 1.5.

Fig. 19: Explosion view valve

1 Set of screws for cartridge holder

2 Cartridge holder

3 Adjust screw

4 Microdispensing valve

5 Connections for compressed air

for valve cooling – in (use

optional)

6 Connections for compressed air

for valve cooling – out (use

optional)

7 Tappet rod with tappet spring

8 Tappet centering screw

9 Tappet centering piece

10 Tappet sealing PE

11 Fluid box body with O-ring BY

12 Nozzle insert

13 Nozzle fixation nut

14 Isolation body (optional)

15 Connector BY

16 Heater MDH-48-BY

17 Tightening screw

18 Cartridge base CHI

19 Cartridge

20 Cable connection – Actuator

(red)

21 Cable connection – Sensor

(yellow)

22 Connection for heater cable

23 Connection for compressed air