Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. Rustam1

    Machining (turning) the products from cermet TiC-(Ni-alloy)

    Hello, Mike, Many thanks for a clear and comprehensive response. Our task - to minimize machining allowances. On ball from cermet TiC-(Ni-alloy) diameter of 100 mm we can do machining allowance of 0.3-1.0 mm. After our experiences and taking into account your valuable advice one conclusion -...
  2. Rustam1

    Machining (turning) the products from cermet TiC-(Ni-alloy)

    For electrolytic grinding spherical surfaces also need special equipment and tooling. Cermet contains 30-50% metal, therefor possible processing electrochemically. Electrode speed - 0.1 mm / min. This is a good speed. But for every item needs its own electrode. Probably, incisive processing -...
  3. Rustam1

    Machining (turning) the products from cermet TiC-(Ni-alloy)

    Hi, Mike, I am sorry. In fact, some photos can not be open. Once again I am sending the first 5 photos. http://files.engineering.com/getfile.aspx?folder=08427ae5-6a69-4ff5-a556-919edf9b6db6&file=Ball_DN50_Cermet_TiC-(Ni-alloy).jpg...
  4. Rustam1

    Machining (turning) the products from cermet TiC-(Ni-alloy)

    Hi everybody, Thank you very much for your answers. Was no feedback, so i was unable to respond in time. I attached the explanatory files: http://files.engineering.com/getfile.aspx?folder=e59780ba-8bf9-4637-a4b6-c08f26afec30&file=Ball_DN50_Cermet_TiC-(Ni-alloy).jpg...
  5. Rustam1

    Warping due to heat-affected zone

    Right direction - cooling of the weld zone. To completely eliminate the hole deformation need the part head with the hole immersion in water and to weld.
  6. Rustam1

    Machining (turning) the products from cermet TiC-(Ni-alloy)

    Hi everybody! Wе have developed the technology of fabrication of complex shapes items from cermet TiC-(Ni-alloy) for use at temperatures up to 1000 C. We must select the incisors for turning. Experiments have shown that the incisors of cubic boron nitride, of diamond composites (content...
  7. Rustam1

    Elastic connection of pipes

    Dear all, I ask you to evaluate the draft of detachable connection of two stainless steel tubes (see file attached). Plug connection is necessary to be able to ensure the movement of the pipe 2 relation the pipe 1 and replace it in the event of leakage. The range of movement of the tube 2 -...
  8. Rustam1

    seal face material selection.

    Dears, For named conditions most suitable material is SiC + Metal bellows from stainless steel. Suppliers much. This is assuming that no thermal and mechanical shocks If there are oft thermal shocks, the silicon carbide is quickly destroyed. It is understood that the polymers, even modified, are...
  9. Rustam1

    Operating experience of ball valves with rising stem

    Dear all, The main drawback of the ball valve - the high torque on a rotating shaft(stem). There are ball valves with rising stem, for example, the "Orbit". Designed for use in the abrasive environments at temperatures up to 430 C. Before turning the ball is removed from the seat. In this case...
  10. Rustam1

    Ball valves against gate valves and globe valves in the refinery

    The difficulties are clear, but we are spent quite a lot of effort and money and we have much progress on the development of ball valves from cermet TiC-Me - I wrote on the positive results of production tests . Therefore, the transition to other areas we not can to consider. Thank you all for...
  11. Rustam1

    Ball valves against gate valves and globe valves in the refinery

    Hi, Danlap Many thanks for the detailed answer. Previously I would like to clarify: 1. Cermet TiC-Me we have developed a long time ago for use in punching tools. After this we decided to use a cermet in the ball valve. 2. Our technology is most effective in hard and wear-resistant products...
  12. Rustam1

    Ball valves against gate valves and globe valves in the refinery

    Dear MJCronin, We are at the stage of experimental work and produced ball valves DN50mm, PN25-40mm. Working temperature 550-600 °C - limited due to the properties of the materials of springs and seal rings. Operating temperature cermets - up to 1100 °C. The plans - manufacture of ball valves...
  13. Rustam1

    Ball valves against gate valves and globe valves in the refinery

    Hello everybody! I have questions. We have produced ball valves with gate hard alloy (cermet) TiC- (Ni-alloy). This is not a coating - valves are completely made of wear resistant cermet. The specific weight (6,5 g / cm3) and the cost of manufacturing the cermet is 2.5 times lower than that...
  14. Rustam1

    Extreme Temperature Rotary Seal

    There are seals from thermo-expanded graphite. Operating temperatures of 600 C or higher, are intended for both moving and fixed joints. Recommend to turn to specialized companies for the production of such seals: "SGL-Polycarbon", "SIGRAFLEX", "Union Carbide"(GRAFOIL).
  15. Rustam1

    Ball valve for thermal power plants

    You right, it is necessary to consider different options and to study the market well. We will consider the possibility of manufacturing of products, specified by you. The technology enables to produce individual items (parts) of cermet (with metal tides) and their welded together. We also...
  16. Rustam1

    Ball valve for thermal power plants

    Hello, moltenmetal and gerhardl, I apologize for the delay in response. Automatic information about your response I have not received. Yes a globe valve, not "global" - this is my mistake. Probably, i am will have many mistakes, because i in stage study english. Please, specify on my mistakes...
  17. Rustam1

    Ball valve for thermal power plants

    Hello Gerhardl, Thank you for reply. Currently there used the global valve, for example, DN20mm. Operating modes not more, as an example: the water, the pressure of 373 bar, a temperature is 280 С degrees; or vapor, the pressure of 250 bar, a temperature is 545 C degrees. The main drawback...
  18. Rustam1

    Ball valve for thermal power plants

    Dear all! How do I know the use of ball valves in thermal power plants is limited due to: -high torque on the shaft of the ball at the opening due vapor or water high-pressure, because "floating ball"; -high wear a ball or seats at the half-open state, so easily damaged. Maybe I missed...
  19. Rustam1

    Finding material which can fulfill certain requirements

    I recommend the tool material hard alloy WC-Co10% (WC-8%, WC-15%, WC-20% etc.). Properties as degree C: 1. Low electrical resistivity =18-20 microhm-cm. 2. High thermal conductivity =55-70 W/m-k 3. Low specific heat capacity =210 J/Kg-Kdegree 4. Low coefficient of thermal expansion...
  20. Rustam1

    Grinding Sperical Surface Seat

    israelkk: "...micro lines shown in the picture are leak paths". Yes all true. By this method we have not gotten completely treated seat. The photo shows the seat, which is not completely processed. Below is shown full procecced ball valve. So far, for the treatment of the seat we use the...

Part and Inventory Search

Back
Top