Description

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

  • Without any external driving energy, low cost；
  • Simple structure, little maintenance work;
  • The set point can be adjusted and the range is wide, convenient for the user to do continuous adjustment;
  • Using the pressure balance valve structure, ensure the constant pressure of medium;
  • Body pressure, convenient pipe installation
  • No packing, frictionless movable components, sensitive control, high control precision.

Operational principle

  • 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.https://ysmeter.net/wp-content/uploads/2021/05/Picture33.png

Control Outlet Pressure

  • 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.

Control Inlet Pressure

Popular materials of parts

Specifications and technical parameters

Note：

  • Production can be according to customers’ special requirements;
  • Flange can be produced according to ANSI、JIS, etc.;
  • when the flow is small the diameter stays unchanged; use valve throttling device to achieve customers’ requirements.

Size and weight

Note：

  • Flange standard is HG/T20592-2009 PN1.6MPa;
  • Valve body pressure, no external pipeline.

Installation, application and notice

1.Installation:

A Before installation, clean the pipeline to make enough straight pipelines at the entrance and is equipped with filter;
B The valve should be installed vertically upright in horizontal pipelines; inclined when necessary; try to avoid horizontal installation;
C In order to ensure the product maintenance or faulty continuous production, should be set to bypass valve, as shown below:

2.Application and notice

  • The outlet pressure is measured to set pressure before delivery. Adjust the nut to change the set pressure.
  • The pressure controlling valve should be installed in a place which temperature does not exceed -25~55℃；
  • Because the pressure regulating valve has pressure balancing diaphragm; it can not be exchanged for nominal pressure of 1.5. The valve is suitable for micro pressure automatic regulating occasions.
  • In the condition of controlling pressure difference, when controlling the front and back pressure difference, body pressure into the lower diaphragm cover and back body pressure into the upper diaphragm cover in order to control the pressure difference.
  • In the condition of controlling pressure difference, when controlling pressure difference of two mediums, back body pressure into the lower diaphragm cover and the second medium pressure into the upper diaphragm cover in order to control the pressure difference.

3.Usage：

  •  Open cut-off valve before and after valve slowly;
  • Open the micro pressure valve top cover, regulate spring, make back pressure fit the working condition; cover the spring cover in order to be dust and water proof.

Accessories:

1.Tube and taps are equipped with valve；
2.Equip with stainless steel manual ball valve according to customer’s requirements.