I agree the required temperature range is extreme. While Stellite 6 (welded overlay) is common practice for seating surfaces it is hard and somewhat brittle and will crack when exposure to rapid temperature changes. I would expect Stellite 12 (solid form) would also crack while underging a rapid...
Thanks hsbco
The problem is some of the new federal stimulus package funding has a "buy American" Clause and requires valves made in America of American materials. I have received several questions asking for an American company that makes cast iron or ductile iron globe valves.
Regards,
ABSCOTT
I am looking for a U.S. company that makes cast iron or ductile iron globe valves 3-12 inch. Seems every company I take with now makes the valves in China or India.
Regards,
ABScott
Greetings to all. I have been on assignment for several months.
CCI developed the original "drag" trim and was awarded a patent on the design concept. Twenty plus years ago CCI management wanted to penetrate the asian market place and signed a mutual agreement with KOSO Japan. CCI was granted...
FFV5,
I have used Vespel for valve seats but only in nuclear applications where the cost could be justified. These applications were typical power plant valves at water and steam temperatures.
We have made thousands of globe cold box valves and the typical valve soft seat material is Kel-F...
danice,
I know of no document that makes a distinction between "pressure-retaining" and "pressure-containing" parts and I agree with jte's last sentence. In the real world these terms are used interchangeably.
In theory, if you have a section view of a valve assembly that is internally...
Packdad,
There are many different bonnet joint designs and more gasket designs and materials than you can imagine. Without knowing the specifics it is had to give you an answer.
The most complete bonnet-joint analysis technique may be found in the ASME, Boiler & Pressure Vessel Code, Section...
71713
Agree with BIGINCH, the applicable standard should be ASME B31.1,Power Piping Standard. I have 2001 and fittings are covered in section 106, but section 106 refers you to additonal sections, 122.7, Piping for Flammable or Combustible Liquids and 122.8, Piping for Flammible Gases etc...
BVMan,
I agree with STYMIEDPIPER. ASTM A182, F316 and F316L are essentially the same except the "L" grade has a much lower carbon content. This makes this grade easier to weld but does lower the strength slightly.
I assume the customer rejected your proposal because the service conditions...
jawilke,
How much room do you have? This may be a design & build to order application.
The US Navy did use water operated valves in the reactor systems of the nuclear submarines but I don't remember who made them.
abscott
jawilke,
Check out web site rexa.com. They make self-contained electro-hydraulic rotary actuators that provide very accurate control. If they can provide an actuator with enough procision you may be able to drop a new actuator on the existing valve. Good luck.
Hope this Helps,
ABScott
GainControl,
Sorry for the late post but I have been out of the office several days. The 300 Series Stainless Steels are excellent trim materials for valve trim because they have high corrosion resistance to a wide variety of chemicals. They are however fairly soft and in applications where the...
GainControl,
The choice of valve trim material is largely based on service conditions (Temperature & Differential Pressure.) You can use 316 SS up to 300 psid and about 600F. Beyond these boundaries the hardened materials are generally used (17-4PH, 410SS, 416SS) but to reduce the corrosion...
EYECONZ,
Since you are passing a small volume intermittantly the Autoclave Engineers needle valve, or similar, is probably the most cost effective. I suggest you talk with the supplier and see if you can get hardfaced (Stellite) seats and plugs. This will increase the service life cosiderably...
GainControl,
Assuming you are a user of valves I recommend you talk to the valve supplier and get their recommendation. Some of the preliminary questions I have are 1) what is the gas?,2)what type of valve is this?, and 3) how big is the valve?
Typical valve trim materials are:
316 SS - ASTM...
