Self operated pressure regulating valve

ZZYPtypeSelf operated pressure regulating valve

Product Introduction

1、 Purpose and Characteristics

ZZYPtypeSelf operated pressure regulating valveIt is an actuator product that does not require any external energy and utilizes the energy of the regulated medium to achieve automatic regulation. The product features the ability to work in places without electricity or gas, while also saving energy. The pressure setting can be adjusted freely during operation. With quick opening flow characteristics, sensitive action and good sealing performance, it is widely used in the automatic control of gas, liquid and steam medium pressure reduction and stabilization (used for post valve regulation), or pressure relief and stabilization (used for pre valve regulation) in various industrial equipment such as petroleum, chemical industry, electric power, metallurgy, food, light textile, machinery manufacturing and residential buildings.

two. Structure and principle of action

The pressure regulating valve mainly consists of four parts: the detection actuator, the pressure regulating valve, the condenser, and the isosceles triangle connecting pipe behind the valve. Its structure (see Figure 1).

Figure 1aA pressure regulating valve used to control the pressure behind the valve, which operates in a pressure closed manner. The principle is as follows: the medium flows into the valve body in the direction of the arrow, passes through the valve core and valve seat, and is then output after throttling. After being cooled by a condenser (used when the medium is steam), the other route is introduced into the actuator to act on the diaphragm, causing the valve core to undergo corresponding displacement, achieving the purpose of pressure reduction and stabilization. If the pressure behind the valve increases, the force acting on the diaphragm increases, compressing the spring and driving the valve core, reducing the valve opening until the pressure behind the valve drops to the set value. Similarly, if the pressure behind the valve decreases, the force acting on the diaphragm decreases. Due to the reaction force of the spring, the valve core is driven, causing the valve opening degree to increase until the pressure behind the valve rises to the set value.

Figure 1bA pressure regulating valve used to control the pressure in front of the valve, which operates in a pressure open manner. The principle is as follows: the medium flows into the valve body in the direction of the arrow, and after being cooled by the condenser (used when the medium is steam), it is introduced into the actuator to act on the diaphragm, causing the valve core to undergo corresponding displacement, achieving the purpose of pressure relief and stabilization. As the pressure in front of the valve increases, the force acting on the diaphragm also increases, compressing the spring and driving the core to increase the valve opening until the pressure in front of the valve drops to the set value. Similarly, if the valve opening decreases until the pressure in front of the valve rises to the set value.

Figure 1bTheZZYP-16KtypeSelf operated pressure regulating valve

1Inlet connector 2Exhaust pipe 3Testing institutions 4Inlet pipe 5Cover screw

6Condenser 7Spring 8Valve stem 9Valve core 10Corrugated pipe

11Pressure regulating disc 12Injection port screw 13Pressure tube 14Valve front connecting pipe

15Valve seat 16Valve body

3、 Main technical parameters and performance indicators, materials

1Main technical parameters and performance indicators

2Determination of pressure regulation range

The pressure regulation range is segmented, as shown in the main parameters and performance indicators table. The control pressure should be selected as close as possible to the middle value of the regulation range (see Table 1).

3The relationship between the pre valve pressure and the post valve pressure of the pressure regulating valve

The self regulating valve itself is a regulating system, and the valve itself has a given pressure drop requirement. The pressure regulating valve behind the valve（BTo ensure that the pressure behind the valve is within the given range, the pressure in front of the valve must reach the given value. The requirements can be found in Table 2.

Table II

4Dimensions and weight

5

Valve core structure form

Valve body working temperature and allowable pressure

4、 Installation, use and maintenance

1Installation; Valve at room temperature (≤80When used in gas or low viscosity liquid media at a temperature of ℃, it is installed upright on a horizontal pipeline, as shown in Figure 3, similar to the usual pneumatic thin film regulating valve.

aTheZZYP-16BtypeSelf operated pressure regulating valve

1Stop valve 2Pressure gauge 3Filter 4、Self operated pressure regulating valve 5Pressure gauge

bTheZZYP-16KtypeSelf operated pressure regulating valve

Figure 3. Installation when the medium is gas or low viscosity liquid

If the medium used is steam,Self operated pressure regulating valveIt needs to be installed upside down on a horizontal pipeline, as shown in Figure 4.

aTheZZYP-16BType pressure regulating valve

1Stop valve 2、6Pressure gauge 3Filter 4Condenser 5Pressure regulating valve

Figure 4. Installation when the medium is steam

five.When installing, pay attention to the following points:

（1） The condenser must be higher than the actuator of the pressure regulating valve and lower than the connecting pipe behind the valve (pressure regulating valve behind the valve) or in front of the valve (pressure regulating valve before the valve) to ensure that the condenser is full of condensate.

（2） The pressure tapping point shall be at a proper position away from the pressure regulating valve, and the pressure regulating valve in front of the valve shall be greater than2Double the pipe diameter, and the base note valve shall be greater than6Double the diameter of the pipeline.

（3） For the convenience of on-site maintenance and operation, there should be appropriate space around the pressure regulating valve, and stop valves and bypass manual valves should be installed before and after the valve, as shown in Figure 5.

Figure 5 Installation plan for pressure regulating valve group

Note: The dashed line in the figure represents another allowable direction for the inlet and outlet of the pipeline

（4） The diameter of the pressure regulating valve is too large（DN≥100When necessary, there should be a fixed bracket.

（5） The direction of medium flow should be consistent with the arrow on the valve body, and the center of the front and rear pipelines should be aligned with the center of the two flanges of the pressure regulating valve to avoid excessive stress on the valve body.

（6） A filter should be installed in front of the valve to prevent impurities from clogging the medium.

（7） The regulating valve should be installed at an ambient temperature not exceeding-25℃~55At a temperature of ℃.

2, Use

The operating procedure for using gas or low viscosity liquid at room temperature: (see Figure 3)

（1） Slowly open the front and rear shut-off valves of the valve.

（2） Loosen the exhaust plug until gas or liquid overflows from the actuator.

（3） Then tighten the exhaust plug again, and the pressure regulating valve can work. The required pressure value can be obtained by adjusting the pressure regulating disc. When adjusting, pay attention to the pressure indication value, and the action should be slow, without causing the valve stem to rotate along with it.

Operating procedures when using steam: (see Figure 4)

（1） Twist from the condenserxiaInjection port screw.

（2） Twist the exhaust plug of the actuator.

（3） Use a drain to add water through the injection port until the exhaust hole flows out.

（4） Tighten the exhaust plug and continue to inject water until it overflows the injection port.

（5） Tighten the injection port screw.

（6） Slowly open the front and rear shut-off valves of the pressure regulating valve.

（7） Adjust the pressure regulating disc and observe the pressure reading until it reaches the required level.

3Maintenance

After the regulating valve is put into operation, the maintenance workload is generally very small. Usually, it is only necessary to observe whether the pressure readings before and after the valve comply with the process

The required value is sufficient. In addition, observe whether there is leakage in the stuffing box and actuator. If there is leakage, tighten or replace the stuffing box and diaphragm.

Common troubleshooting methods for pressure regulating valves (see Table 5)

5、 Ordering Notice

Please provide the following information when placing an order: