Gas is flowing when knob is held in ,stops when no longer held

Yun Hee requested 2 quotes from Plumbers in Campsie

Gas flow works while the knob is pushed in and held, but stops when knob is no longer held.

Gas oven needs a new solonoid. no gas flowing igniter lights up
westinghouse under bench oven. ignighter lights up but no gas is flowing. its...

Gas heater checked
Would like to have general check up on heater.

Gas heater serviced
We have not had our gas heater serviced for a few years.

Chef brand oven not working (grill and top burners working fine)
Oven is fairly old but top half is in good working order. Gas does not appear...