Pressure Regulator Fundamentals

Which of the following best describes the purpose of a pressure-reducing regulator?

• To adjust flow to match downstream demand while keeping the downstream pressure constant.

• To maintain downstream pressure only

• To measure upstream pressure and restrict flow as required to maintain a specified inlet pressure.

• To satisfy downstream demand only

The primary limitations of direct-operated regulators are:

• Speed of response

• Droop

• Accuracy

• Higher lock-up pressures

Overpressure is: (select all that applies)

• A primary consideration in the design of any piping system

• Evidence of some failure in a pressure system

• the reason for installing a relief valve in a pressure system

• Generally of little concern

The maximum pressure rating of any pressure system is determined by the ratings of:

• Downstream equipment

• The downstream piping

• The outlet rating of the regulator

• All of the above

If the setpoint on a 627 regulator is 20 psig, choose the best spring for the application (if accuracy is important):

• Spring range: 5 to 20 psig

• Spring range: 15 to 40 psig

• Spring range: 35 to 80 psig

Our application requires a gas flow of 200 SCFH, choose the best orifice option if all orifices below satisfy the flow condition:

• Orifice Size: 1/4 inch

• Orifice Size: 1/2 inch

• Orifice Size: 1 inch

Worst case condition in a system wherein overpressure protection is needed?

• Regulator failed wide open

• Regulator failed fully closed

Pilot is the brain of the operation while the Main Valve is the ______ of the operation.

Which of the following are found in pilot-operated regulators?

• A restricting element

• A measuring element

• A pressure amplifier

• A loading element

A regulator is a self-contained ​_____ and ​actuator combination.