Fig. 566 Diaphragm seal

Symbol image

Fig. 566 Diaphragm seal

Application and performance features of the diaphragm seal
  • Especially for use in the food industry and in hygiene applications

  • Cleaning and sterilization in circulation and continuous flow processes (CIP and SIP) possible; maximum cleaning temperature of 150°C

  • Free of dead space, the diaphragm is welded flush to the front

  • To protect pressure gauges from excessively hot or aggressive media

  • For remote measurements without external energy, a capillary of up to 5 m can be installed between the diaphragm seal and the indicator. Height differences between the diaphragm seal and the indicator must be taken into account when constructing the measuring system

  • The factory-assembled, adjusted and calibrated measuring system consists of the diaphragm seal and, depending on customer requirements, a pressure gauge, pressure transmitter or other pressure measuring device

Measuring device connection

G1/2B, female thread

Process connection

to DIN 11851 with union nut in stainless steel 1.4301 polished, flush welded, DN 25 to DN 80

Upper part with measuring device connection

CrNi steel 1.4435

Membrane

Stainless steel 1.4435, flush-welded, free of dead space

Reference temperature T ref

25°C

Filling liquid

Vegetable oil (FN 1)

Sketch of diaphragm seal

DN

PN

d

dM

c

h

P min.

25

40

63

28

54

21

0-2.5 bar

32

40

70

34

54

21

0-2.5 bar

40

40

78

28

53

21

0-1 bar

50

25

92

46

48

22

0-1 bar

65

25

112

52

54

25

0-1 bar

Special materials for lower part with process connection e.g: Monel, Hastelloy C4

on request

Capillary from the diaphragm seal to the measuring device

on request

Cooling element between diaphragm seal and measuring device (from 100°C)

on request

Diaphragm in special material e.g: Hastelloy C4 (2.4610); Monel 400 (2.4360)

on request

Special thread for measuring device e.g: G1/4B, 1/4 NPT, 1/2 NPT

1 pc.

White oil (FN2), FDA approval

1 pc.

Glycerine (FN3), FDA approval

1 pc.

Glycerine/water (FN4), FDA approval

1 pc.

Important notes

Height differences for systems with long-distance piping must be specified when ordering

Free of dead space, upper and lower part welded

Seal not included in scope of delivery

Limits of use

Maximum nominal pressure: 25 bar or 40 bar, depending on the nominal diameter, see dimension table

Minimum display range (pressure gauge NG 100), see dimension table

This specification refers to our current standard with regard to design, dimensions and materials. JAKO Messtechnik GmbH reserves the right to make changes or modifications without prior notice.

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