High temperature self-operated steam pressure reducing and stabilizing valve

 Pressure  regulator valve depends on the pressure and temperature of the medium flowing through the valve itself as an energy source to drive the valve to work automatically, without the need for external power supply and secondary instruments. This kind of self-operated regulating valve uses the feedback signal (pressure, pressure difference, temperature) of the valve output end to be transmitted to the actuator through the signal pipe to drive the valve flap to change the opening degree of the valve, so as to adjust the pressure, flow and temperature. This control valve is divided into direct action and indirect action of two types.

 Pressure  relief valve B type direct action type is also known as spring load type, its structure has elastic elements such as: spring, bellows, bellows type temperature package, etc., using elastic force and feedback signal balance principle.

 Indirect  acting valve rear steam pressure regulating valve ZZYP-16B closed type, adding a director (pilot valve) it plays an amplification role in feedback signals and then through the actuator, driving the main valve clack movement to achieve the purpose of changing valve opening. In the case of a pressure regulating valve, the feedback signal is the outlet pressure of the valve, which is introduced into the actuator through the signal pipe. If it is a flow control valve, there is an orifice plate (or other resistance device) at the outlet of the valve. The differential pressure signal is taken out from both ends of the orifice plate and introduced into the actuator. If it is a temperature regulating valve, the outlet of the valve has a temperature sensor (or temperature package) to drive the actuator through the thermal expansion and contraction of the medium in the temperature sensor.

III. Determination of pressure adjustment range:
Pressure adjustment range is segmented, see main parameters and performance index table, control pressure should be selected near the middle value of adjustment range as far as possible.
Fourth, the valve pressure regulating valve, the relationship between the valve pressure and the valve pressure:
  It is a regulating system itself, and the valve itself has certain pressure drop requirements. For the pressure regulating valve (B type) after the valve, in order to ensure that the pressure after the valve is within a certain range, the pressure before the valve must reach a certain value.
V. Determination of the mode of action of the whole machine:
 Pre-valve pressure regulating valve (K type) its initial position of the spool in the closed position, when the pre-valve pressure gradually increased, the valve gradually opened until the pre-valve pressure stabilized at the required given value.
 The valve core in its initial position is in the open position. When the valve pressure gradually increases, the valve gradually closes until the valve pressure stabilizes at the required given value.
VI. Product features:
 ◆ No additional energy, can work in places without electricity and gas, both convenient and energy-saving.
 ◆ The pressure segmentation range is fine and cross each other, and the adjustment accuracy is high.
 ◆ Pressure setpoint can be set continuously during operation.
 ◆ For valve pressure regulation, the ratio of valve pressure to valve pressure can be 10:1~10:8.
 ◆ Rubber diaphragm type detection, high precision and sensitive action of actuator.
 ◆ Pressure balance mechanism is adopted to make the regulating valve responsive and accurate.
VII. Installation instructions:
     ZZYP-16B closed typesteam pressure regulating valve iswidely used in petroleum, chemical industry, electric power, metallurgy, food, textile, machinery manufacturing and civil buildings and other industrial equipment, can be applied to gas, liquid, steam medium pressure reduction and stabilization (valve regulation) or pressure relief and stabilization (valve regulation), but because it uses the pressure of the medium itself to operate the actuator, the actuator is filled with medium, so the installation method should be matched with this.
     ZZYP-16B self-operated steam desuperheating and pressure-reducing regulating valveshall be installed at the appropriate position away from the pressure regulating valve. The pressure-opening pressure regulating valve shall be larger than 2 times the pipe diameter, and the pressure-closing pressure regulating valve shall be larger than 6 times the pipe diameter. When installing the condenser, pay attention to the position of the condenser, so that it is higher than the film head and lower than the process pipeline to ensure that the condenser is filled with condensate.

VIII. Material of main parts:
 ◆ Valve body: ZG230-450, ZG1Cr18Ni9Ti, ZGCr18Ni12Mo2Ti
 ◆ Valve core: 1Cr18Ni9Ti, Cr18Ni12Mo2Ti
 ◆ Valve seat: 1Cr18Ni9Ti, Cr18Ni12Mo2Ti
 ◇ Valve stem: 1Cr18Ni9Ti, Cr18Ni12Mo2Ti
 Cover: A3, A3 steel coated tetrafluoroethylene stainless steel
 ◆ Filler: B, F, oil resistant rubber
Nine, the use of methods and daily maintenance:self-pressure regulating valve boiler steam pressure automatic regulating valve pipeline should generally be installed horizontally.
How to use:
1. Operation when gas or low viscosity liquid is used at normal temperature:
 ( 1) slowly open the valve before and after the stop valve;
 ( 2) Loosen vent plug until gas or liquid escapes from actuator
 (3) Then re-tighten the exhaust plug, and the regulating valve can work. The required pressure value can be obtained by adjusting the pressure regulating disc. When adjusting, observe the pressure indication value. The action shall be slow and the valve stem shall not rotate with it.
2. Operation when steam is used:
 ( 1) Unscrew the lower drain screw from the condenser
 ( 2) Loosen the actuator exhaust plug.
 ( 3) Use the drain to add through the injection port until the exhaust hole flows out.
 ( 4) Tighten the exhaust plug and continue to fill the water until it overflows the injection port.
 ( 5) Tighten the filler screw
 ( 6) Slowly open the front and rear stop valves of the regulating valve.
 (7) Adjust the pressure regulating disc and observe the pressure gauge until the value reaches the requirements.
Maintenance:
　　After put into operation, general maintenance work is very little, usually just observe whether the pressure indication before and after the valve meets the requirements of the process. In addition, observe whether the packing box and actuator leakage, if leakage should be tightened or replaced packing and diaphragm.
X. Common troubleshooting:
The pressure before the valve does not rise and always acts below the demand value?
 Causes:
 1 , set spring stiffness is too small
 2 . The valve core is stuck by foreign matter;
 3 . Valve stem and push rod are stuck;
 4 , valve core, valve seat damage, leakage is too large 5, valve diameter is too large
 Exclusion methods;
 1 . Replace the spring
 2 . Reassemble
 3 . Readjustment
 4 , re-grinding or replacement
 5 . Replace smaller caliber
 XI. Material selection of key valve components:
 Safety valves are usually artificially part of the pressure vessel or pressure system they protect, and careful consideration must be given to the selection of materials for safety valves. In particular, for pressure-retaining and pressure-bearing parts, the selection of materials must comply with the requirements of specifications and standards. The main pressure-retaining or pressure-bearing component of the safety valve is the valve body, and the bonnet and bolts connecting the valve body and bonnet are also considered to be part of the pressure-retaining housing of the safety valve, so the pressure vessel specification also has material requirements for the bonnet and connecting bolts. Failure of these components may result in leakage of pressure, high temperature media or chemicals.
Factors affecting material selection for safety valve components include:
Pressure, temperature, corrosive medium or environment, relevant application specifications and standards.
Selection of materials for key components:
Certain parts of the safety valve are particularly critical to the safe operation and function of the flash. These components can be grouped into the following categories:
Pressure retaining component: A component that maintains inlet pressure (body) or outlet pressure (bonnet), including body bonnet attachment bolts.
Long-term liquid contact parts: parts in contact with the medium for a long time and maintain the tightness of the valve.
Guide component: provides disc to nozzle guidance and ensures stem movement up and down at all times.
Spring: Provides force to close valve.
Bellows (balanced design only): Provides backpressure compensation and/or corrosion protection for guide parts and springs.

 Hangzhou  Lianggong Valve Co., Ltd. production and sales: ZZYP-16B self-operated steam desuperheating and pressure reducing valve, self-operated steam pressure reducing valve, self-operated steam regulating valve and other steam special series pressure regulating valve.