Safety Devices

Question 1

Safety devices used for appliance regulator

Answer 1

Surge arrester
Vent limiting orifice
Automatic safety vent limiting orifice

Question 2

Safety devices for a service regulator

Answer 2

Internal safety relief
Lock-off mechanism
Positive shut off

Question 3

How does a surge arrestor function ?

Answer 3

Induces soft lighting, controls flame rollout.

Causes regulator to open slowly and close normally

Question 4

How does a vent limiting orifice function ?

Answer 4

To allow equal limits of inhalation and escape air from the upper diaphragm chamber.

If diaphragm does rupture leakage is limited to 1cfh

Question 5

How does an automatic safety vent limiting device operate ?

Answer 5

Gives sensitive respond even at low pressure

Ball check permits inhalation of the regulator for fast diaphragm regulator response

Question 6

How does a safety relief valve work ?

Answer 6

Special seats located at the diaphragm and linkage connection

Seat will open allowing gas to pass out of regulator through vent if downstream pressure too high

Question 7

How does a lock - off mechanism work ?

Answer 7

Equipped with an additional seat design to close, shutting off flow if outlet pressure gets too high or low

Question 8

How does positive shut off work ?

Answer 8

When no glow occurring to the appliance service regulator will lock up within 10% of original outlet pressure setting