Application of check valves Z15.1, Z15.2
The check valves type are automatic devices that prevent the back flow of the fluid.
- Z15.1 – for horizontal installation
- Z15.2 – for vertical installation (with spring)
Diameters: from DN10-65
Pressure:from PN63 to PN420 bar
Working medium: water, water steam (overheated steam) and other fluids used in power engineering and chemical industry
Working temperature: up to 600°C
Application: power engineering, chemical and nuclear industry
Technical description of check valves Z15.1, Z15.2
- Body is produced from forging.
- Models Z15.1 and Z15.2 have pressure seal construction (without sealing gaskets between bonnet/body)
- The seats of body and piston (disc) ar welded-on with hard-alloy material (Stellite) сwith hardness 40-45 HRC and contents of Cr 27%-32%
- Connection on welding type BW according to DIN, GOST, CSN (possibility for SW – according to ANSI) and on flanges, which are welded to the body.
Advantages of check valves Z15.1, Z15.2
- Pressure seal bonnet construction
- Repairable form of the body’s seat
- The piston (disc) is of stainless steel W№1.4541 / X6CrNiTi18-10 and welded-on hard-alloy material (Stellite) providing strength, stability and durability
- The closing part of the piston (disc) is formed under a special radius, and the seat is in a cone. This ensures low friction and high reliability of closing in a closed ring, protecting the closing organs from abrasion and cavitation
- Long term cycle of operation without maintenance or repair
- Service life of 10 years (10,000 cycles of first repair) at an average load
- Unified design from DN10-65
- Combining four type forgings eight nominal sizes - provides shortened delivery times at competitive prices
- Connection ends can be produced acc. to customer’s request
- Possibility for production with non-standard building lengths by means of extensions and inspection of the welded seams with X-ray analysis
- The standard implementation of the construction uses the highest quality materials for this class of valves. The construction is seismically tested according to НП -068-05 ( class of safety III and seismic category II) and has a "Certificate of seismic resistance