The direct acting pressure regulating valve, the ZMHN heavy weight pressure regulating valve, is one of the most old-fashioned and bulky self operated valve structures. It uses the valve front and back pressure

The force difference is used as the signal source and can be adjusted and controlled by a set of gravity hammer. The utility model can be applied to the low voltage regulator without additional energy

Occasion.

Optimal consideration

The working principle of the direct acting pressure regulating valve and ZMHN heavy weight pressure regulating valve

(1) the working principle of the pressure regulating valve after the valve is used:

A valve type direct acting pressure regulating signal is obtained from the valve behind the pipe and, as it is applied to the membrane chamber, is increased by an increase of pressure in the gram

After the force produced by the heavy hammer, the valve core moves downward and gradually closes with the valve seat so that the flow cross section is reduced until the pressure at the back of the valve is equal to the given value

Up to now, on the contrary, as the effect on the membrane chamber is reduced, the valve moves upward and the flow cross section increases until the pressure is equal to that of the valve

Fixed value.

(2) the working principle of the pressure regulating valve before the valve is made:

The valve front type direct acting pressure regulating valve is adjusted by the valve front pipe, and it increases with the pressure acting on the membrane chamber

After overcoming the force generated by the heavy hammer, the spool moves downward and gradually leaves the valve seat so that the flow cross section increases until the pressure drops down to the given valve

On the contrary, when the pressure on the membrane chamber is reduced, the force generated by the heavy hammer causes the valve core to rise, and gradually closes with the valve seat, so that the flow cross section is reduced

Until the pressure before the valve rises to a given value.