Armaturen STEVI 423 Series Operating And Installation Instructions

Operating and installation instructions
3-way control valves - STEVI
1.0 General information on operating
instructions ..................................................... 2
2.0 Notes on possible dangers............................ 2
2.1 Significance of symbols ..........................................2
2.2 Explanatory notes on safety information .................2
3.0 Storage and transport ................................... 2
4.0 Description...................................................... 3
4.1 Scope of applications ..............................................3
4.2 Operating principles ................................................3
4.3 Diagram ..................................................................4
4.4 Technical data .........................................................5
4.5 Marking ...................................................................5
5.0 Installation....................................................... 5
5.1 General notes on installation...................................5
5.2 Requirements at the place of installation ................6
5.3 Installation instructions concerning actuators .........6
6.0 Putting the valve into operation.................... 7
7.0 Care and maintenance ................................... 7
7.1 Replacement of stem sealings ................................7
DN300
Series 423
Contents
7.1.1 EPDM-ring stem sealing design ....................... 7
7.1.2 Stuffing box packing design ............................... 8
7.2 Replacement of internal parts ................................ 9
7.2.1 Replacement of plug and stem ......................... 9
7.2.2 Replacement of the seat ring............................. 9
7.3 Tightening torques................................................ 10
7.3.1 Tightening torques for hexagon nuts .............. 10
7.3.2 Tightening torques for seat rings .................... 10
8.0 Troubleshooting ........................................... 10
9.0 Troubleshooting table ..................................11
10.0 Dismantling the valve or the top part ...... 12
11.0 Warranty / Guarantee ................................. 12
12.0 EC declaration of conformity .................... 13
Rev. 0040318001 0410 englisch
®
423