Pilot Operated Self-operated Pressure Regulating Valve

Main technical parameters and performance indicators

Application examples

1. Replacing the 212 type micro pressure valve

The 212 type micro pressure valve generally requires a medium pressure of ≤ 0.1MPa in front of the valve, while the 214B type self-operated pressure-regulating valve with a command is not subject to this restriction.

2. For nitrogen sealing device

The upper end of the finished oil in the nitrogen sealing device is covered with nitrogen gas, and its pressure is generally around 100mmH2, which is controlled by the nitrogen sealing protection device. When the outlet valve is opened to drain oil, the liquid level in the outlet tank decreases. At this time, the opening of the 214B nitrogen supply regulating valve increases, and nitrogen is added to the outlet tank to increase the pressure to the set value. When the oil inlet valve is opened, the liquid level increases, the volume of the gas phase decreases, and the nitrogen pressure increases. At this time, the 214B nitrogen supply regulating valve is closed, while the 214B leakage regulating valve is opened under the action of a pressure controller, and nitrogen is discharged to reduce the pressure to the set value. To ensure the safety of the storage tank, a breathing valve should be installed on the top of the tank. Nitrogen supply pressure adjustment: When selecting the 214B pressure regulating valve with a set value of 1KPa (100mm. W. C), adjust the pre-compression (stretching) amount of the main spring 2 to achieve this; Nitrogen relief pressure adjustment: In the pressure controller part of the 214K relief valve, the main spring pre-compression shrinkage is adjusted to achieve. Generally, to avoid frequent opening and closing of the nitrogen sealing device, the nitrogen relief setting value should be far away from the nitrogen supply pressure setting value, such as 2KPa (200mm. W. C). Adjustment of the setting value of the breathing valve: After adjusting the above two settings, in order to avoid frequent opening and closing of the breathing valve, the setting value of the breathing valve should be greater than the pressure relief setting value. The two settings should not be too close together. The breathing valve model is: 216 type. The pressure setting value for the 214B type is Pc, and the pressure setting value for the 214K type is P1. The values of Pc and P1 should not be too close together to prevent the valve from working too frequently. The setting value for the discharge pressure P2 of the breathing valve should be greater than P1, and the values of P2 and F1 should not be too close together. The relationship between the three values is Pc

DN	L	S	H1	H
20	150	308	390	715
25	160	308	390	715
32	180	308	390	735
40	200	394	435	755
50	230	394	435	755
65	290	394	435	795
80	310	394	435	795
100	350	394	435	825
150	480	498	565	1105

Application Design Cases

The above example takes the storage tank 1KPa as an example

1. The pressure tapping position of the 214B valve should be close to the storage tank (or buffer tank).

2. The pressure gauge should be located not far from the pressure measuring point to avoid unnecessary disputes.

3. The pipeline behind the 214B valve should not be too small (generally larger than the pipeline before the valve).