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  1. Blow down valves

Blow down valves

Blow down valves

The purpose of blowdown valves is to depressurize the equipment by sending the unwanted gases to flare. Blowdown valves are emergency on-off valves activated by a signal from the Emergency Shut Down (ESD) system, rather than direct activation by overpressure in the protected equipment. Blowdown valves are on-off valves, often installed in a parallel configuration to pressure relief valves on equipment. This depressurization is different than equipment protection performed by pressure relief valves. Certain on-off valves are closed on emergency shutdown (ESD) of a system. Closing of these valves can lead to overpressure in some process equipments. At the same time, ESD system sends signal to open up the blowdown valves and to release the excess gas to flare, thus preventing an overpressure scenario.

Since blowdown valves are simply on-off valves, they cannot restrict the gas flow. The blowdown lines are often equipped with restriction orifices downstream of blowdown valves to restrict the gas flow being sent to the flare to a certain limit.

The term gas blow down is referred to venting of gas accumulated in equipments, process facilities, oil production wells etc. The gas which is to be blown down is not desired to be used for production of a variety of possible reasons and is usually vented through a flare. The flare burns the hydrocarbons before venting product gases to atmosphere.

Gas blowdown in pressure vessels

Emergency shutdown of some processing facilities may end up in sending high pressure gas to certain other pressure vessels, leading to overpressure. To prevent this overpressure scenario, these pressure vessels should be equipped with blowdown valves in addition to the pressure relief valves. Blowdown valves are triggered by the same emergency shutdown to open up and send the excess gas to vent or flare.
Gas blowdown in oil production wells

Oil production wells which have been shut in for a period, can develop a gas cap at the wellbore by accumulation of the gases percolating through the formation. It is desirable to remove this gas cap by flaring the accumulated gases before starting well intervention. This flaring of gases is referred to as casing blowdown.

Other equipments connected to the well to handle the produced fluids are often equipped with blowdown valves as well. These blowdown valves act to prevent the overpressure in case of emergency shoutdown as discussed above.

Asco Controls

Asco Controls offers a wide range of products and is the leader of solenoid valves. We combine 100 years of experience with technology. Asco Controls offers the largest selection of 2, 3 and 4-way solenoid valves. A solenoid valve, the electromagnetic part of the valve which consists of a coil. The valves of Asco Controls supplied by ITT Controls are made to the most demanding fluid control applications to execute.

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Penn Controls

Penn Controls, now part of Johnson Controls, designs and manufactures more than 125 years for buildings, appliances, automotive and energy solutions. Also in the petrochemical and process industries Penn Controls is a well known brand and is supplied by ITT Controls.

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SIT Controls

ITT Controls also supplies SIT products and components for the petrochemical and process industries. Sit's equipment for safety, control and regulation are suitable for many applications. One should think of wall-mounted and freestanding boilers, stoves, fireplaces, patio heaters, clothes dryers, water heaters, household stove, pool heaters, heating systems for recreational vehicles and catering equipment such as ovens, fryers and bain maries.

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McDonnell & Miller

ITT Controls also supplies products and components made by McDonnell & Miller. McDonnell and Miller are now part of ITT. The range of McDonnell & Miller includes several products for the petrochemical and process industries. McDonnell & Miller specializes particularly in Boiler Controls and power switches.

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Pactrol

Pactrol Controls, now part of Emerson Climate Technologies, designs and manufactures automatic ignition mechanisms and control devices for gas and oil fired appliances for both domestic and commercial use. Earlier Pactrol Controls White Rodgers already incorporated. ITT Controls delivers products and components of Pactrol Controls and White Rodgers.

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