There is another type of actuator that has not been mentioned here and is technically superior in both a double acting and spring return model.
A quality vane type actuator such as a Kinetrol, offers true rotary motion, without the hysterisis typically associated with rack and pinnion and...
Gosco Valves routinely produces Duplex and Super Duplex valves for various industries. Capabilities range from carbon steel to Zirconium in almost any concievable configuration or end connection.
www.goscovalves.com
Try contacting GGOSCO Engineering Inc.
They have handled many applications with extremely low Cv requirements and can design a valve to your specific needs.
www.ggosco.com
Lucyn,
A 1-piece valve tends to be reduced port product, since the trim needs to be installed through the end connection. Generally they are flange valves and a sleeve is threaded into the port to contain the seats/ball and presses up against an internal seal (some very cheap NPT valves are...
Take a look at GGOSCO's Vari-V valve. It will give you a good understanding of how a ball valve with a V orifice cut in the ball can offer excellent control.
www.ggosco.com
There are several things to consider when looking at a control valve for helium.
The stem packing configuratiuon will be your primary concern. Typically, helium is used as a test medium for stem leakage, for the simple fact that its is a very difficult gas to seal.
The issue of 'cold...
Steve,
I would suggest that you seriously take a look at a metal seated ball valve. The hardened trim will offer you the best life expectancy and truly help reduce your maintenance costs. Don't be scared away by the price increase. You will probably find that a quality metal seated valve will...
I would recommend that you contact GGOSCO Engineering Inc.
They can be reached at,
1272 Speers Rd. Unit 4
Oakville, ON, Canda
L6L 5T9
P: 905-825-2627
F: 905-825-4051
sales@ggosco.com
www.ggosco.com
Give them a call and ask to speak to Chris and I am sure that they will be able to help you...
In general a plug valve will have a higher torque than an equivalent size ball valve. This is due to the increased seating area of a standard rotary plug valve.
Being that you will require a 30" ball valve it will most likely be trunnion mounted and have a substantially lower torque...
They may be questioning your design for a different reason. Do you have a shut-off valve on the discharge end of your pipeline? If you do, based on your situation, if you were to instantly shut-off the valve on the discharge end, you would most likely encounter severe 'water hammer' and...
In order to check the allowable leakage rate on a valve rated to have a class IV shut-of, you do currently have enough information.
Cv is quite simply the flow rate in usgpm with a 1 psig pressure drop across the valve. To calculate your allowable leakage rate, multiply the Cv value by 0.01%...
If you want it to comply to ASME Code, use table 3 of B16.34. Choose the class of valve you are looking to verify( eg.150#, 300# etc.), the inside diameter of the body bore and the table will give you the minimum wall thicknesses. B16.34 also gives you the maximum pressure/temperatures a given...
