H11H美标锻钢止回阀有三种阀盖设计形式。一种是螺栓式阀盖,按这种设计形式设计的阀门,其阀体与阀盖用螺栓螺母连接,缠绕式垫片(316夹柔性石墨制造)密封。客户有特殊要求时也可采用金属环连接。二种设计形式是焊接式阀盖,按这种设计形式的阀门,其阀体与阀盖用螺纹连接,全焊密封。客户有特殊要求时也可采用透焊连接。第三种是压力自紧式阀盖,按这种设计形式设计的阀门,其阀体与阀盖用螺纹连接,内压自密环密封。
设计结构和特征:
美标锻钢止回阀的设计与制造符合MSSP-118和ASME B16.34.检验与测试按API 598,标记按MSS-SP-25。
结构:
全径或缩径
升降式止回阀
球式止回阀
旋启式止回阀
按需求内置弹簧
螺栓连接、缠绕垫片密封式阀盖,螺纹连接、全焊密封式阀盖以及螺纹连接内压自紧式阀盖
整体式上密封座
承插端符合ASME B16.11
螺纹连接端(NPT)符合ANSI/ASME B1.20.1
阀瓣可变换为节流型、针型、球型
相关压力:
·800LB
·900LB~1500LB
·800LB、900LB~1500LB
·900LB~2500LB
| NPS | 缩径 | 3/8” | 1/2” | 3/4” | 1” | 11/4” | 11/2” | 2” | |
| 全径 | 3/8” | 1/2” | 3/4” | 1” | 11/4” | 11/2” | 2” | ||
| L | 79 | 79 | 92 | 111 | 120 | 152 | 172 | 200 | |
| W | 61 | 61 | 65 | 79 | 95 | 103 | 118 | 132 | |
| 重量 | 螺栓式 | 1.4 | 1.2 | 1.5 | 3.1 | 3.9 | 5.6 | 8.9 | 12.5 |
| 焊接式 | 1.1 | 1.0 | 1.2 | 2.9 | 3.3 | 4.9 | 8.1 | 10.9 | |
800LB、900LB~1500LB

标准材质明细表:
| 序号 | 零件名称 | CStoASTM | AStoASTM | SStoASTM | |
| A105 | F22 | F304(L) | F316(L) | ||
| 1 | 阀体 | A105 | A182F22 | A182F304(L) | A182F316(L) |
| 2 | 阀座 | A276410 | A276304 | A276F304(L) | A276F316(L) |
| 3 | 阀瓣 | A276420 | A276304 | A276F304(L) | A27F316(L) |
| 4 | 螺母 | A1942H | A1944 | A1948 | A1948M |
| 5 | 摇杆 | A105 | A182F22 | A182F304(L) | A182F316(L) |
| 6 | 垫片 | 316夹柔性石墨 | 316夹PTFE | ||
| 7 | 阀盖 | A105 | A182F22 | A182F304(L) | A182 F316(L) |
| 8 | 螺栓 | A193B7 | A193B16 | A193B8(M) | A193B8(M) |
| 9 | 销钉 | a276420 | A182F304 | A182F316 | |
| 适用介质 | 水、蒸汽、油品等 | 水、蒸汽、油品等 | 硝酸、醋酸等 | ||
| 适用温度 | -29℃~425℃ | -29℃~550℃ | -29℃~200℃ | ||
尺寸(MM)和重量(KG):
美标内螺纹单向阀是一种按照美国标准(如ASME/ANSI B1.20.1) 制造的,阀体带有内螺纹(Female Thread) 连接接口的微型或小型单向阀(止回阀)。其核心功能是强制流体单向流动,并自动防止介质反向回流,广泛应用于仪表测量、液压控制、流体输送等系统。
该阀门的螺纹类型通常为美标NPT(National Pipe Taper)螺纹或美标UN/UNF统一螺纹,这种锥管螺纹能通过螺纹牙型的变形形成有效的密封,连接简单稳定。阀体结构紧凑,可直接旋入带有外螺纹的管道或设备接口中,节省安装空间。其内部启闭元件通常为球体、锥形阀芯或碟片,依靠弹簧力和流体压差实现快速自动启闭。
美标内螺纹单向阀主要特点:
标准螺纹接口: 严格遵循美标NPT等螺纹标准,确保与美标管道元件的兼容性和密封性。
美标内螺纹单向阀结构紧凑: 体积小,重量轻,无需额外的连接件,可直接安装,节省空间。
美标内螺纹单向阀安装简便: 螺纹连接方式简单灵活,便于现场安装和拆卸维护。
美标内螺纹单向阀密封稳定: NPT锥螺纹本身具有较好的密封性,常配合密封剂使用以实现完全密封。
美标内螺纹单向阀启闭迅速: 内部结构响应快,能有效减少水锤冲击,保护上游设备。
多种材质: 阀体可采用黄铜、碳钢、不锈钢等,密封件可选NBR、FKM、PTFE等,以适应水、油、气等多种介质。
美标内螺纹单向阀典型应用:
美标内螺纹单向阀仪表测量系统:压力表、流量计等仪表的引压管接口,防止介质冲击仪表。
美标内螺纹单向阀液压与气动系统:集成于阀块、油缸或气动元件的螺纹口中,作为背压阀或锁紧阀。
冷却与润滑系统:机械设备冷却液、润滑油路的单向控制。
消防设备:灭火器、消防栓的内部管路。
通用工业流体系统:任何需要小型、单向控制的美标管道系统。
Product Overview of American Standard Female Threaded Check Valves
Product Overview:
An American Standard female threaded check valve is a miniature small check valve (non-return valve) manufactured in accordance with U.S. standards (such as ASME/ANSI B1.20.1), featuring a female threaded connection port. Its core function is to enforce unidirectional fluid flow automatically prevent reverse flow of media. It is widely used in instrumentation, hydraulic control, fluid transfer systems.
The thread type is typically NPT (National Pipe Taper) UN/UNF (Unified National Thread), which creates an effective seal through the deformation of the tapered threads, offering a simple reliable connection. The valve body is compact can be screwed directly into male-threaded ports on pipes equipment, saving space. The internal closing element is usually a ball, poppet, disc, which operates automatically via spring force fluid pressure differential for quick opening closing.
Key Features:
Standard Thread Interface: Strict compliance with U.S. thread standards like NPT ensures compatibility sealing with American standard piping components.
Compact Structure: Small size light weight, requiring no additional fittings for direct installation, saving space.
Easy Installation: Threaded connection is simple flexible, facilitating field installation, removal, maintenance.
Reliable Sealing: The NPT tapered thread provides good inherent sealing, often used with sealant for a leak-tight seal.
Rapid Response: The internal structure allows quick response, effectively reducing water hammer protecting upstream equipment.
Variety of Materials: The body can be made brass, carbon steel, stainless steel, etc. Seals can be NBR, FKM, PTFE, etc., to suit various media like water, oil, gas.
Typical Applications:
Instrumentation Systems: Connections for pressure gauge flow meter impulse lines to protect instruments media impact.
Hydraulic & Pneumatic Systems: Integrated into threaded ports of manifolds, cylinders, pneumatic components as back-pressure locking valves.
Cooling & Lubrication Systems: Unidirectional control in machinery coolant lubricant circuits.
Firefighting Equipment: Internal piping of fire extinguishers hydrants.
General Industrial Fluid Systems: Any American standard piping system requiring small, reliable, unidirectional control.
关键术语翻译 (Key Terminology Translation):
美标内螺纹单向阀: American Standard Female Threaded Check Valve
内螺纹: Female Thread / Internal Thread
NPT螺纹: NPT (National Pipe Taper) Thread
锥管螺纹: Tapered Pipe Thread
球体: Ball
锥形阀芯: Poppet
密封剂: Sealant / Thread Sealant (e.g., Teflon tape)
仪表测量系统: Instrumentation Systems
引压管: Impulse Line
背压阀: Back-Pressure Valve
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