UK
Crossover Valve Combinations
DIN: 15 – 500 / PN 10 – 40
ASME: NPS 1/2″ – 20“ / class 150 300
PT range: -30 < T < 230/280°C, vacuum 10-8 mbar
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Design Features
Design Characteristics
Design Characteristics
- all types of AZ-valves combinable
- for cooling and heating cycles
- for pump cycles
- for safety-valves
- for filter-cycles
- for reactor cycles
- available hand-operated, gear-operated and with actuators
Sample applications
Filter-cycle
Replacement or cleaning of filter is possible without any problems by application of AZ-crossover-valve-combinations. When filter 1 is blocked up the valve combination is switched over to flow consequently regulated by filter 2. Therefore it is possible to replace the filter 1 without interruption of the continuous flow. If “LL”- plug is used moreover a continuous flow during the phase of switching is guaranteed. In this case a complete closing during switching is not possible.
Pump-cycle
On break-down of pump 1 an easy replacement of pump 1 is possible by switching the valve combination to pump 2 without interruption of the continuous flow. If “LL”- plug is used moreover a continuous flow during the phase of switching is guaranteed. In this case a complete closing during switching is not possible.
PT-Diagramm
Operating temperatures < -30°C and > 220 °C have to be checked and approved by AZ according to the operating conditions.
Besides the P/T value of the sleeve the limitations of the valve bodies also have to be considered. Please refer to the EN 12516-1 resp. ASME B16.34 in order to choose a proper pressure rating (PN/class). The shown values refer to austenitic stainless steel 1.4408 (A351 Gr. CF8M).
1) For operating temperatures below -10°C low temperature / austenitic steels are required.
2) Sleeve: There are different sleeve materials / compounds available.
Materials
Standard body materials
- Carbon Steel 1.0619, ASTM A216 WCB
- Stainless Steel 1.4408, ASTM A351 CF8M
- Stainless Steel 1.4308, ASTM A351 CF8
- Unalloyed stainless steel casting (low Temp.) 1.1138, LCC/LCB/A352
Standard plug materials
- Stainless Steel 1.4408, ASTM A351 CF8M
- Stainless Steel 1.4308, ASTM A351 CF8
Special materials
- Alloy
- Monel
- Nickel
- Zirconium
- Titan
- Tantal
- other materials on reques
Sealing Systems
Type STD
Standard sealing for all major applications;
Tmax 230°C
Type FS
Firesafe sealing (API 607) with graphite packing for additional
stem sealing; Tmax 230°C
Type CA
Chemical sealing to prevent fugitive emission of aggressive and toxic media
with PTFE packing for additional stem sealing; Tmax 230°C
Type FSN
Firesafe safety sealing (API 607) for fluctuating temperatures
with 3x graphite packing (adjustable) for additional
stem sealing; Tmax 280°C
Type FSN-SL
Firesafe safety sealing (API 607) for fluctuating temperatures
with 3x graphite packing (live loaded disc springs) for additional
stem sealing; Tmax 280°C
Type CASN
Chemical safety sealing for fluctuating temperatures
with 3x PTFE packing (adjustment) for additional stem sealing;
Tmax 230°C
Type CASN-SL
Chemical safety sealing for fluctuation temperatures
with 3x PTFE packing (live loaded disc springs) for additional
stem sealing; Tmax 230°C
Port Forms
Order the desired combination, port form select by AZ.
Dimensions
Actuation
1 Locking Devices
Pilot valve combinations, pad lock eyelets, linear key conception, indexing plunger arrestor.
2 Plug stem extension
Solid construction in stainless steel with T-wrench, Standard extension 100 mm or 150 mm, non standard lengths are available on request
3 Actuators
Actuators for mounting-flange acc. to DIN ISO 5211
NEW: Pneumatic actuator AIR GEAR for plug valves with high torque =150.000 Nm
4 Ratched coupling
To usw on multiport valves with standard 90° actuator for bigger switchpositions than 90°
5 Cover extension
Solid construction in stainless steel, Standard extension 100 mm or 150 mm high, non standard lengths are available on request . Hexagonal bolts on adjustment ring freely accessible. Note: Don’t use with sealing FSN/FSN-SL and CASN/CASN-SL
