YQD-30 Copper-made nitrogen pressure reducer

Precision - scaled Pressure - regulating Valve, High - pressure - regulated Pipeline for Nitrogen Copper - made Pressure - reducing Valve YQD - 30

Model: YQD - 30 Nitrogen Pressure - reducing Valve

Measurement Range: 0.01 - 0.1 (MPa)

Applicable Medium: Nitrogen

Input Pressure (MAP): 15

Rated Outlet Pressure: 0.01 - 0.1 (MPa)

Rated Flow: 60 (m³/h)

Purpose: Nitrogen Pressure - reducing Valve

Structure: Two - stage type

Working Principle: Positive - acting type

Ambient Temperature: 60 (℃)

Packing Quantity: 3

Inlet Connection Thread: G5/8

Outlet Connection Thread: G3/4

Name: Nitrogen pipeline pressure reducer.

Material: Copper-made nitrogen pressure reducer.

Model: YQD-30.

Net weight: 7KG.

Characteristics: Reduce the high-pressure gas in the nitrogen pipeline for use. The pressure reducer can maintain a stable output pressure under working conditions where the input pressure and outlet flow change. It is especially suitable for occasions with high requirements for pressure stabilization accuracy or long-term continuous operation. This ensures its stability and reliability under various working conditions. Due to its stability and reliability, the YQD-30 ammonia pressure reducer is widely used in various gas medium pipelines, such as nondestructive testing, environmental detection, electrical instruments, automated instruments and other fields, ensuring the safety and efficiency of the system.

双级式减压阀和单级式减压阀的区别是什么？

1. **结构复杂程度**

   - **单级式减压阀**：结构相对简单。它主要由一个减压单元组成，通过一个阀门来调节压力。例如，一些简单的家用燃气减压阀，其内部的结构主要是一个弹性元件（如弹簧）和一个阀芯，当进口压力变化时，弹簧的伸缩会直接调节阀芯的开度，从而控制出口压力。

   - **双级式减压阀**：结构较为复杂。它有两个串联的减压单元。就像一个接力过程，第一级先将较高的进口压力初步降低到一个中间压力，然后第二级再将这个中间压力进一步降低到所需的出口压力。这种结构使得双级式减压阀内部的零部件更多，整体构造更复杂。

2. **压力调节精度**

   - **单级式减压阀**：压力调节精度相对较低。因为它是一次性将进口压力降低到出口压力，受到进口压力波动的影响较大。例如，当进口压力突然升高时，单级式减压阀的阀芯可能会因为瞬间的压力冲击而不能精准地调节出口压力，导致出口压力也会有较大的波动。

   - **双级式减压阀**：具有较高的压力调节精度。由于经过两次减压，每一级都可以对压力进行更精细的调节。第一级减压可以缓冲进口压力的波动，第二级再在相对稳定的中间压力基础上进行微调，所以能够更精确地控制出口压力。比如在一些对压力精度要求很高的实验室气体供应系统中，双级式减压阀可以将氮气等气体的压力稳定在很小的波动范围内。

3. **适用压力范围**

   - **单级式减压阀**：一般适用于进口压力和出口压力差值不是特别大的情况。例如，在一些低压的民用供水系统中，供水压力和用水设备所需压力差值较小，单级式减压阀就可以满足要求，它可以将市政供水的稍高压力降低到适合家庭水龙头等设备使用的压力。

   - **双级式减压阀**：适用于进口压力和出口压力差值较大的场合。在工业生产中，如一些高压气体储存罐（压力可达几十MPa）向使用设备（可能只需要几MPa的压力）供气时，双级式减压阀能够更好地处理这种较大的压力差，安全有效地将高压气体降低到合适的使用压力。

4. **稳定性**

   - **单级式减压阀**：稳定性相对较差。因为其对进口压力的变化比较敏感，当进口压力出现频繁或较大幅度的波动时，出口压力也容易跟着波动。比如在一些简单的压缩空气系统中，如果压缩机的输出压力不稳定，单级式减压阀很难保持出口空气压力的稳定。

   - **双级式减压阀**：稳定性较好。它的两级减压结构使得在面对进口压力波动时，有更好的缓冲和调节能力。第一级可以先对波动的压力进行初步处理，第二级再进一步稳定压力，所以能够在复杂的压力变化环境下提供更稳定的出口压力。在一些对气体压力稳定性要求极高的实验环境或者工业生产流程中，双级式减压阀的这种稳定性优势非常明显。

What are the differences between a two-stage pressure reducing valve and a single-stage pressure reducing valve?

1. **Degree of structural complexity**

   - **Single-stage pressure reducing valve**: The structure is relatively simple. It mainly consists of a pressure reduction unit and regulates pressure through a valve. For example, in some simple household gas pressure reducing valves, the internal structure mainly consists of an elastic element (such as a spring) and a valve core. When the inlet pressure changes, the expansion and contraction of the spring directly adjusts the opening degree of the valve core to control the outlet pressure.

   - **Two-stage pressure reducing valve**: The structure is more complex. It has two series-connected pressure reduction units. It's like a relay process. The first stage first reduces the higher inlet pressure to an intermediate pressure, and then the second stage further reduces this intermediate pressure to the required outlet pressure. This structure makes the internal parts of the two-stage pressure reducing valve more numerous and the overall structure more complex.

2. **Pressure regulation accuracy**

   - **Single-stage pressure reducing valve**: The pressure regulation accuracy is relatively low. Because it reduces the inlet pressure to the outlet pressure at one time, it is greatly affected by fluctuations in the inlet pressure. For example, when the inlet pressure suddenly rises, the valve core of the single-stage pressure reducing valve may not be able to precisely regulate the outlet pressure due to the instantaneous pressure impact, resulting in a large fluctuation in the outlet pressure.

   - **Two-stage pressure reducing valve**: It has a higher pressure regulation accuracy. Due to two stages of pressure reduction, each stage can perform finer pressure regulation. The first stage of pressure reduction can buffer fluctuations in the inlet pressure, and the second stage can fine-tune based on the relatively stable intermediate pressure, so it can control the outlet pressure more accurately. For example, in some laboratory gas supply systems with high requirements for pressure accuracy, the two-stage pressure reducing valve can stabilize the pressure of gases such as nitrogen within a very small fluctuation range.

3. **Applicable pressure range**

   - **Single-stage pressure reducing valve**: Generally applicable to situations where the difference between the inlet pressure and the outlet pressure is not particularly large. For example, in some low-pressure civil water supply systems, the difference between the water supply pressure and the pressure required by water-using equipment is relatively small. A single-stage pressure reducing valve can meet the requirements. It can reduce the slightly higher pressure of municipal water supply to a pressure suitable for use by equipment such as household faucets.

   - **Two-stage pressure reducing valve**: Applicable to occasions where the difference between the inlet pressure and the outlet pressure is large. In industrial production, when some high-pressure gas storage tanks (with pressures up to several tens of MPa) supply gas to using equipment (which may only require a pressure of several MPa), the two-stage pressure reducing valve can better handle this large pressure difference and safely and effectively reduce the high-pressure gas to a suitable operating pressure.

4. **Stability**

   - **Single-stage pressure reducing valve**: The stability is relatively poor. Because it is more sensitive to changes in the inlet pressure, when there are frequent or large fluctuations in the inlet pressure, the outlet pressure is also prone to fluctuations. For example, in some simple compressed air systems, if the output pressure of the compressor is unstable, it is difficult for a single-stage pressure reducing valve to maintain the stability of the outlet air pressure.

   - **Two-stage pressure reducing valve**: It has better stability. Its two-stage pressure reduction structure gives it better buffering and regulating ability in the face of fluctuations in inlet pressure. The first stage can initially process the fluctuating pressure, and the second stage can further stabilize the pressure, so it can provide a more stable outlet pressure in a complex pressure-changing environment. In some experimental environments or industrial production processes with extremely high requirements for gas pressure stability, this stability advantage of the two-stage pressure reducing valve is very obvious.