(b) Main hole, which is tapered inside, and which conveys the main stream of fuel from the barrel. When the gun is not being fired, the valve needle is seated in the main hole of the nozzle. When the gun is being fired, the needle is withdrawn from the nozzle seat, permitting the fuel to be forced from the gun.
b. Removal of barrel and valve-body assembly. If gun group and tank group are connected, release any pressure in the fuel tanks by compressing the valve lever and the grip safety. Then disassemble as follows:
(1) Unscrew the fuel-hose assembly from the fuel-valve body only if this is necessary for maintenance.
(2) Remove spring retainer and plug from end of fuel-valve body and remove valve spring.
Fig 50. Valve needle, yoke block, and lock nut ready for installation in fuel-valve body.
(3) Unscrew diaphragm cap and pull out washer, support, and valve-diaphragm assembly. To prevent loss of valve-needle adjustment ([Fig 54]), do not disturb position of yoke block by turning the needle.
Fig 51. Placing diaphragm assembly in position in fuel-valve body.
