Posts Tagged ‘stromquist training’
Control Trends has added a new feature called Control Talk. Control Talk is a new way to bring our viewers the chance to see and hear from the best minds in the HVAC, DDC, and Industrial Controls Market. Think of it as a cross between Stromquist Radio and Stromquist TV.
In episode 1 I interview Vern Peterson of MOV training.
Vern is the go to guy when it comes to Read More
If you read Stacies recent post you know our Pneumatics, VAV, and Boiler classes will be coming back to Atlanta this fall. These classes are very popular. Check out this short video ” Peak inside a Stromquist pneumatics class” to see what the class is all about.
As someone once said, “He who hesitates waits, and waits, and waits…maybe that’s why they are called waiters” Think about it why wait ? to reward the non procrastinators call Edna before June 1 and reserve your spot with a $50 deposit and we will give you $75 off on the pneumatics class and we will even give you $20 off on Edge safety sunglasses.
Edna can be reached at 1.800.241.9471
Honeywell has added a new Delphi video presentation to its Environmental and Combustion Controls website.
Go to: http://customer.honeywell.com/Business/Cultures/en-US/Default.htm and look to the left of the page under the “What’s New” section, then click on the Delphi Combustion Efficiency Panel Video Presentation (in red) and follow instructions to the video.
Other Delphi and related Information:
http://www.controltrends.org/2010/02/on-site-training-for-honeywell-delphi-2/
http://www.controltrends.org/2009/11/first-commercial-installation-of-delphi/
http://www.controltrends.org/2009/08/honeywell-announces-delphi/
http://www.controltrends.org/2009/08/simply-amazing-product/
http://www.controltrends.org/2009/08/honeywell-abc900-advanced-burner-control/
http://www.controltrends.org/2009/08/honeywell-mf020-oxygen-sensors/
Boiler contractors see these valves all the time when working on equipment. Generally the steam relief valve is often little understood, often incorrectly installed, and usually neglected. A little refresher on these valves might be in order.
How Relief Valves Work
As the pressure of the steam within a boiler approaches the set pressure of the valve, the steam pressure on the underside of the actuating disc approaches the pressure of a spring applied to the outer side of the disc. When equilibrium is passed, the disc starts to lift off its seat. The moment this happens, steam is suddenly released all around the disc to what is called the “huddling chamber.” This chamber increases the area of the disc that sees steam pressure, thus increasing force. This increased area under steam pressure makes the pressure much more unbalanced in the direction of the valve discharge opening and therefore pops the valve into a wide open position. When the valve opens with a “pop” the valve seat is preserved from wiredraw caused by slow opening.
Closure of the valve occurs only after the boiler pressure is dropped several pounds below the set point. The reduction of the area of the disc seeing steam causes the disc to firmly close against the valve seat.
Relief Valve Installation
Proper installation of a steam relief valve seems somewhat simple and is, as long as two areas of concern are followed.
The first area of concern is valve distortion. Valve distortion occurs when the valve is improperly wrenched in, using the valve body instead of supplied wrench flats. Distortion also occurs when the discharge side of the safety relief valve is made to bear the weight of the discharge piping. To prevent this distortion use a short nipple from the valve to an independently supported bell reducer or drip pan elbow. These valves are precision devices and any distortion will affect accuracy and calibration.
The second area of concern is discharge piping. For a safety valve to do its job it must be sized properly to adequately relieve all the steam the boiler is capable of producing while operating at its maximum. All piping to or from a safety relief valve must be at least as large as the valve’s connections. Also, the restrictive effect of elbows and the friction losses in pipe must be taken into account. For this reason, piping runs should be as short as possible and pipe sizes should be generous.
If you need help in replacing or sizing a steam relief valve please contact Stromquist and Company at 1-800-241-9471. All others can order this product from one of our affiliates at CGNA.
Our newest employee, Paul Morin, recently conducted a training class on installations and terminations. Before coming to work for Stromquist, Paul worked in HVAC contracting so he knows a lot about the industry. He is a very sharp guy and a great teacher. His class covered methods of wiring, different types of wiring and cables, VAV box schedules, mechanical drawings and much more. After the class, those in attendance said it was very beneficial and that they really learned a lot from it. One attendee said that what he learned in the class will definitely help him on future installations and wiring. The class was received so well that we are going to have Paul teach it again after the first of the year. We will post more information on it when we get it scheduled, so be on the lookout and plan to attend if you’re in the Atlanta area.
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