How should adjust the discharge pressure and the safety valve reseating pressure

1. For the recoil safety valve plate and seat adjustment ring structure is the use of seat adjustment ring to be adjusted. High pressure safety valve cover valve, hydraulic valve, pressure relief safety valves.
First, unscrew the adjusting screw ring, and then inserted into the tool such as a screwdriver from the screw hole is exposed, toggle adjustment ring on the teeth, so that adjustment ring turning left. When the adjustment ring to the left for the counterclockwise rotation, its elevated position, the discharge pressure and reseating pressure will be reduced. Conversely, when the adjustment ring to the right rotates clockwise, reduce its position, discharge pressure and reseating pressure will be higher. Each adjustment, adjustment ring rotation rate should not be too large (usually 2-3 teeth can rotate). After each adjustment screw should be fixed, it ends in the adjustment ring groove between two teeth, both to prevent rotation of the adjustment ring, not on the adjusting ring radial pressure. For security purposes, prior to toggle adjustment ring, it should be appropriate to reduce the inlet pressure Natural Gas Safety Valve (generally should be less than 90% of the opening pressure) to prevent sudden opening during adjustment of the valve, causing the accident.
2. For having upper and lower adjusting ring (oriented sets and have a seat adjustment ring) patio heater gas valve structure, the adjustment more complex.
The adjustment ring is used to change the flow of media in the valve flap folding rear side reflection angle, thereby changing the size of the fluid forces, in order to adjust the pressure back seat. Increase the adjustment ring, the turning angle decreases, the fluid force is decreased, so that the back seat pressure increased. Conversely, when the adjustment ring on the lower, back seat pressure is reduced. Of course, the adjustment ring at the same time changing the pressure back seat, also affects the discharge pressure, which increases the adjusting ring so that the discharge pressure has increased, reducing the adjustment ring so that emissions decreased, but the degree of impact is not back Pressure on as obvious.
By adjusting the ring to change the size of the Gas Burner Safety Valve between the channel and adjusting ring, thus changing the initial valve opening pressure between the valve and adjusting ring chamber accumulate medium degree of size. When elevated seat adjustment ring, the degree of pressure build-up increases, so that the valve opening ratio stage decreases rapidly to a sudden sharp turn. Therefore, increased discharge pressure valve seat adjustment ring can be reduced. It should be noted that the seat adjustment ring should not rise too close to the valve. As leakage at the sealing surface can lead to premature valve suddenly opened, but because this time the media pressure is not enough to keep the valve in the open position, the valve was then closed, then valve occurrence frequency hopping. Seat adjustment ring is mainly used to reduce the proportion of valve, open stage and adjust the discharge pressure, but also have an impact on the pressure back seat.