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 -...
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 -...
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...
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...
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.
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...
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 -...
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...
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...
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...
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...
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...
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...
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).
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...
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...
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...
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...
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...
