This website uses cookies.

On our web pages and in our online shop, we use strictly necessary cookies and cookies that are needed to process your queries. We also use tracking cookies, which help us to optimize our online presence and offer you a better browsing experience as a result. ...

You can find further information in our Data Protection Statement. Data protection statement

OK Personal settings more
Functional cookies

These cookies are strictly necessary to enable you to use all the functions and features of GEMÜ web pages. Consequently, they are enabled by default and cannot be disabled. If you wish to avoid these cookies, you can do so by changing the settings in your browser.

Web analysis cookies

Here you can decide whether you want to allow a unique web analysis cookie to be stored in your browser that will enable the website operator to record and analyse various statistical data. If you do not want to allow this, click on the following link to store the Piwik opt-out cookie in your browser.

Unfortunately, GEMÜ is currently unable to store settings for multiple browsers or about multiple user accounts. It is also possible that, irrespective of the security settings you have set in your browser, the cookies set by GEMÜ will be deleted when you close the browser and will therefore no longer be available in your next session. If you close or change your browser, or if you use more than one PC, you may have to make some of the changes again.

GEMÜ R677

Manually operated diaphragm valve

  • Description
  • Features
  • Technical specifications
  • Accessories

The GEMÜ R677 2/2-way diaphragm valve has a low maintenance plastic bonnet and is manually operated. An integral optical position indicator is standard. The High-Flow valve body provides compact dimensions at high flow rates.

  • Same mounting height planes over multiple nominal sizes
  • Compact plant design due to flow optimised valve bodies
  • Integral optical position indicator
  • Connection: Flange; Spigot; Union end
  • Actuator: Manual
  • Body material: ABS; Inliner PP-H, grey / outliner PP, reinforced; Inliner PVDF / outliner PP, reinforced; PP (GF); PP inliner / outliner; PVC-U; PVDF
  • Conformities: EAC
  • Max. operating pressure: 10 bar
  • Max. media temperature: 80 ° C
  • Min. media temperature: -20 ° C
  • Nominal sizes: DN 15 (1/2''); DN 20 (3/4''); DN 25 (1''); DN 32 (1 1/4''); DN 40 (1 1/2''); DN 50 (2''); DN 65 (2 1/2''); DN 80 (3''); DN 100 (4'')

Fitting Accessories

Product video

How diaphragm valves with plastic valve bodies work

00:44 min
580 Views
Online since 16.09.2015
More videos
Deionization of boiler feed water using an ion exchanger
Further applications

Product applications

Deionization of boiler feed water using an ion exchanger

In steam boiler systems, salts that have dissolved in the water lead to corrosion and deposits. To avoid corrosion and deposits, depending on the operational mode and design of the steam generator, there are important requirements regarding the quality of the boiler feed water. In a deionization system, the salts that have dissolved in the water are removed using ion-exchange resins. These salts are dissociated, i.e. in positive (cations) and negative particles (anions), and as a result, a so-called desalination line is set up as follows: cations exchanger – CO2 degasifier – anions exchanger – mixed-bed fi lter. Moreover, for the installation to operate properly, a regeneration station and neutralization are required.