进口天然气减压阀
一、进口天然气减压阀产品概述
品牌：美国欧可OKE
进口天然气减压阀，也叫天然气调压阀（Gas pressure reducing valve）是指用于天然气管道系统，通过调节弹簧压力设定出口压力、利用膜片传感出口压力变化，通过导阀启闭驱动活塞调节主阀节流部位过流面积的大小，实现减压稳压功能。从流体力学的观点看，减压阀是一个局部阻力可以变化的节流元件，即通过改变节流面积，使流速及流体的动能改变，造成不同的压力损失，从而达到减压的目的。然后依靠控制与调节系统的调节，使阀后压力的波动与弹簧力相平衡，使阀后压力在一定的误差范围内保持恒定。

二、进口天然气减压阀产品特征
1、广泛用于气体管路，如空气、氮气、氧气、氢气、液化气、天然气等气体。
2、属于先导活塞式减压阀。由主阀和导阀两部分组成。主阀主要由阀座、主阀盘、活塞、弹簧等零件组成。导阀主要由阀座、阀瓣、膜片、弹簧、调节弹簧等零件组成。控制精确。
3、通过调节调节弹簧压力设定出口压力、利用膜片传感出口压力变化，通过导阀启闭驱动活塞调节主阀节流部位过流面积的大小，实现减压稳压功能。进口压力不断变化的情况下，保持出口听压力和温度值在一定的范围内

三、进口天然气减压阀 技术参数及性能
公称压力(Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
壳体试验压力(Mpa)* 2.4 3.75 6.0 9.6 15.0 24
密封试验压力(Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
最高进口压力(Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
出口压力范围(Mpa) 0.1-1.0 0.1-1.6 0.1-2.5 0.5-3.5 0.5-3.5 0.5-4.5
压力特性偏差(Mpa)△P2P ANSI2365，GB12246-1989
流量特性偏差(Mpa)P2G ANSI3568，GB12246-1989
最小压差(Mpa) 0.15 0.15 0.2 0.4 0.8 1.0
渗漏量 X/F(聚四氟乙稀/橡胶)：O渗漏  Y(硬密封)：按ANSI6863

四、进口天然气减压阀 额定流量系数
DN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 350 400 500
Cv 1 2.5 4 6.5 9 16 25 36 64 100 140 250 400 570 780 1020 1500

五、进口天然气减压阀 主要零件材料
零件名称 零件材料
阀体 阀盖 底盖 WCB/FCB*
阀座 阀盘 2Cr13/304*
缸套 2Cr13/25(镀硬铬)/304*
活塞 2Cr13/铜合金/铜合金*
活塞环 合金铸铁/对位聚苯*
导阀座 导阀杆 2Cr13/304*
膜片 1Cr18Ni9Ti
主阀 导阀弹簧 50CrVA
调节弹簧 60Si2Mn
密封垫(X/F/Y) 橡胶/聚四氟乙稀/硬质合金
导阀体 导阀盖 25/304*

六、进口天然气减压阀安装说明
1、气体减压阀安装必须严格按照阀体上的箭头方向保持和流体流动方向一致。如果气体不清洁含有一些杂质，必须在减压阀的上游进水口安装过滤器(我们建议过滤精度不低于0.5mm)。
2、为了操作和维护方便，气体减压阀一般直立安装在水平管道上。
3、为了防止气体减压阀阀后压力超压，应在离阀出口不少于4M处加装一个减压阀。
4、减压阀阀前和阀后必须装截止阀，更换或者维修时开关气体用
5、气体如果有冷凝水的话，需要装汽水分离器，防止冷凝水对减压阀活塞或者膜片的损坏。

七、进口天然气减压阀业绩
中国石油天然气集团公司，中国石油化工集团公司，英荷皇家壳牌石油公司，西门子股份公司，广东华南特种气体研究所有限公司，通用电气公司，北京桑翌实验仪器研究所杭州同益气体研究所,哈尔滨工业大学，江苏天瑞仪器股份有限公司，长沙开元仪器股份有限公司，比亚迪股份有限公司，美国德州仪器，瓦莱罗能源公司，惠州市方舟工业气体有限公司，江苏通广石化工业气体有限责任公司，杭州三泰工业气体设备有限公司

Imported natural gas pressure reducing valve
I. Overview of imported natural gas pressure reducing valve products
Brand: US Ouke OKE
The imported natural gas pressure reducing valve, also called the gas pressure reducing valve, is used for the natural gas pipeline system. The outlet pressure is set by adjusting the spring pressure, and the outlet pressure of the diaphragm is sensed by the diaphragm. The piston adjusts the size of the flow area of ??the throttle portion of the main valve to realize the pressure reduction and voltage stabilization function. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of decompression. Then, relying on the adjustment of the control and regulation system, the fluctuation of the post-valve pressure is balanced with the spring force, so that the post-valve pressure remains constant within a certain error range.

Second, the characteristics of imported natural gas pressure reducing valve
1. Widely used in gas pipelines such as air, nitrogen, oxygen, hydrogen, liquefied gas, natural gas and other gases.
2. It belongs to the pilot piston type pressure reducing valve. It consists of two parts: the main valve and the pilot valve. The main valve is mainly composed of a valve seat, a main valve disc, a piston, a spring and the like. The pilot valve is mainly composed of a valve seat, a valve disc, a diaphragm, a spring, an adjustment spring and the like. Control is precise.
3. Adjust the outlet pressure by adjusting the spring pressure, and use the diaphragm to sense the outlet pressure change. The pilot valve is opened and closed by the pilot valve to adjust the overflow area of ??the throttle portion of the main valve to realize the pressure reduction and voltage stabilization function. Keeping the outlet listening pressure and temperature within a certain range when the import pressure is constantly changing

Third, imported natural gas pressure reducing valve Technical parameters and performance
Nominal pressure (Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
Shell test pressure (Mpa)* 2.4 3.75 6.0 9.6 15.0 24
Seal test pressure (Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
Maximum import pressure (Mpa) 1.6 2.5 4.0 6.4 10.0 16.0
Outlet pressure range (Mpa) 0.1-1.0 0.1-1.6 0.1-2.5 0.5-3.5 0.5-3.5 0.5-4.5
Pressure characteristic deviation (Mpa) △ P2P ANSI 2365, GB12246-1989
Flow characteristic deviation (Mpa) P2G ANSI3568, GB12246-1989
Minimum differential pressure (Mpa) 0.15 0.15 0.2 0.4 0.8 1.0
Leakage X/F (polytetrafluoroethylene/rubber): O leakage Y (hard seal): according to ANSI 6863

4. Imported natural gas pressure reducing valve
DN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 350 400 500
Cv 1 2.5 4 6.5 9 16 25 36 64 100 140 250 400 570 780 1020 1500

5. Imported natural gas pressure reducing valve Main parts and materials
Part Name Part Material
Body bonnet bottom cover WCB/FCB*
Seat valve disc 2Cr13/304*
Cylinder liner 2Cr13/25 (hard chrome plating)/304*
Piston 2Cr13/copper alloy/copper alloy*
Piston ring alloy cast iron / para-polyphenyl *
Guide valve seat Guide valve stem 2Cr13/304*
Diaphragm 1Cr18Ni9Ti
Main valve pilot valve spring 50CrVA
Adjustment spring 60Si2Mn
Seal (X/F/Y) Rubber / Polytetrafluoroethylene / Hard Alloy
Pilot valve body Guide valve cover 25/304*

Sixth, the installation instructions for imported natural gas pressure reducing valve
1. The gas pressure reducing valve must be installed in strict accordance with the direction of the arrow on the valve body and the direction of fluid flow. If the gas is not clean and contains some impurities, the filter must be installed at the upstream inlet of the pressure reducing valve (we recommend a filtration accuracy of not less than 0.5mm).
2. For ease of operation and maintenance, the gas pressure reducing valve is generally installed upright on a horizontal pipe.
3. In order to prevent pressure overpressure after the gas pressure reducing valve, a pressure reducing valve should be installed at not less than 4M from the valve outlet.
4. The pressure reducing valve must be equipped with a shut-off valve before and after the valve, and the switch gas should be used for replacement or maintenance.
5. If the gas has condensed water, it needs to be equipped with a steam separator to prevent the condensate from damaging the piston or diaphragm of the pressure reducing valve.

Seven, the performance of imported natural gas pressure reducing valve
China National Petroleum Corporation, China Petrochemical Corporation, Anglo Royal Shell Oil Company, Siemens AG, Guangdong Huanan Special Gas Research Institute Co., Ltd., General Electric Company, Beijing Sangqi Experimental Instrument Research Institute, Hangzhou Tongyi Gas Research Institute, Harbin Institute of Technology, Jiangsu Tianrui Instrument Co., Ltd., Changsha Kaiyuan Instrument Co., Ltd., BYD Co., Ltd., Texas Instruments, Valero Energy, Huizhou Fangzhou Industrial Gas Co., Ltd., Jiangsu Tongguang Petrochemical Industrial Gas Co., Ltd. Company, Hangzhou Santai Industrial Gas Equipment Co., Ltd.