Code 71 PTFE / PVDF / EPDM Rubber Diaphragm Seals Three Piece

Code 71 PTFE / PVDF / EPDM Rubber Diaphragm Seals Three Piece

Application examples

Water treatment plants, washing and cleaning installations

Plants for the food and foodstuff industries, the chemical industry and electroplating

Equipment for the photographic industry, laboratory, analytical and medical apparatus

Description

The GEMÜ code 71 diaphragm is a three-piece diaphragm that has been developed for use in industrial applications. The diaphragm is made up of a PTFE face, a PVDF intermediate layer and an EPDM backing. The diaphragm is based on the tried and tested design and dimensions of the code 5M diaphragm with regard to the PTFE face. The diaphragm shows excellent permeation properties against gases.. The diaphragm is extremely resistant to wet chlorine in particular due to the PVDF intermediate layer and the titanium mounting pin.

Technical specifications

• Media temperature:-20 to 100 °C
• Diaphragm material:PTFE/PVDF/EPDM
• Diaphragm sizes:10 | 25 | 40 | 50 | 80 | 100
• Vacuum:up to 70 mbar (absolute)

Features

• The diaphragm shows excellent permeation properties, as tested and certified by TÜV SÜD
• Excellent resistance to wet chlorine is tested and confirmed by TÜV SÜD
• Resistant against virtually all chemicals, such as strong acids, alkalis and salts
• Use of a titanium mounting pin (grade 7)
• Mechanical stop integrated into the diaphragm face mounting pin in order to ensure correct installation
• The diaphragm has no leakage holes in the EPDM backing in order to improve the permeation properties
• The design of the diaphragm face is based on the tried and tested contour of the code 5M diaphragm

Replacement diaphragms from GEMÜ

for aseptic and industrial processes

Diaphragms are wearing parts. They need to be regularly inspected and replaced otherwise malfunctions can occur, possibly resulting in hazardous situations.

Specifying the maintenance cycles

The maintenance intervals for inspecting and replacing diaphragms are application-dependent. In order to determine a suitable maintenance interval, the maintenance history and the stresses placed on the parts due to frequent sterilisation, cleaning processes or frequent cycle duties must be taken into account. The type of media must also be considered; the maintenance interval is considerably shorter for viscous or abrasive working media in comparison to inert liquids, for example.

Inventory

If it has not yet been possible to conclusively document the maintenance interval, or if the diaphragm is only to be replaced in the event of leakage, we recommend creating a stockpile in order to be able to react promptly. However, the inventory should take into consideration that elastomer components have a maximum recommended storage and operating time. This is between one and six years for GEMÜ diaphragms – when they are stored correctly.

Procurement cycles

In our experience, it is worth setting up a small storage area for small, frequently used parts and establishing a rolling order system at the same time in installations with a relatively large number of diaphragm valves. In the latter case, you will automatically receive a subsequent delivery or a further delivery of diaphragms from us in a time period defined by you.

Diaphragm dimensions

* Diaphragm size

The thread of the diaphragm pin "W" corresponds to Whitworth standard.

• Our service:

1. Packaging is neutral packing or customized packing.

2. We will reply you within 24 hours.

3. We will also provide you with good after-sales service.

4. OEM or ODM orders are welcomed.

5. Trial orders are acceptable.

6. High quality and factory price.

7. 100% ensured the quality.