General

    ZZV series of self-operated Micro Pressure Control Valve there is no need for any external power source, only used fluid own energy to adjusted the valve opening automatically. The valve uses the regulating mechanism which has quick open flow characteristic of balanced single-seat valve, without packing and frictionless movable components internal., it makes fluid pressure stable, high precision adjusting, which could control micro pressure conditions and make sure safe and reliable sealing performance, arbitrary adjust of set value could be also achieved during operation. So it is widely used for the micro pressure automatic regulation sites of all kinds of fuel, half-finished petroleum of the industrial furnace burning system, oil tank stocking protective gas and heat treatment protective gas etc,.

Characteristics

1.Without any external driving energy, low cost；

2.Simple structure, little maintenance work;

3.The set point can be adjusted and the range is wide, convenient for the user to do continuous adjustment;

4.Using the pressure balance valve structure, ensure the constant pressure of medium;

5.Body pressure, convenient pipe installation

6.No packing, frictionless movable components, sensitive control, high control precision.

 Operational principle      

1.Operational principle of self-operated outlet micro pressure control valve:  

The initial plug position is opening. When the inlet pressure P1 pass the plug and seat it changes to outlet pressure P2; P2 gets through a pressure guiding pipe input lower membrane chamber in the diaphragm; the reaction force and the spring balance spool position determines the opening level of valve and thus controls the outlet pressure.

When the outlet pressure P2 increases, the inlet pressure P2 acting on the diaphragm also increased. Meanwhile, the force on the diaphragm is bigger than the spring reaction force, which makes the plug close on the seat position and decrease the valve opening level; P2 decreased until the force on the diaphragm equals to the spring reaction force and make P2 as set figure and vice versa.

2.Operational principle of self-operated inlet micro pressure control valve:  

The initial plug position is closing. When the outlet pressure P1 pass the plug and seat it changes to outlet pressure P2; P1 gets through a pressure guiding pipe input lower membrane chamber in the diaphragm; the reaction force and the spring balance spool position determines the opening level of valve and thus controls the inlet pressure.

When the inlet pressure P1 increases, the force P1 acting on the diaphragm also increased. Meanwhile, the force on the diaphragm is bigger than the spring reaction force, which makes the plug get away from the seat position and increase the valve opening level; P1 decreased until the force on the diaphragm equals to the spring reaction force and make P1 as set figure and vice versa. 

Specifications and technical parameters

1.Main technical parameters of ZZV standard                                            Table 1

2.Main technical parameters of ZZV standard   KV≤7                                       Table 2

Note：

1.Production can be according to customers’ special requirements;

2.Flange can be produced according to ANSI、JIS, etc.;  

3.when the flow is small the diameter stays unchanged; use valve throttling device to achieve customers’ requirements.