进口不锈钢法兰截止阀，节流阀性能描述 Performance description

不锈钢法兰截止阀(节流阀)阀杆轴线与阀座密封面垂直。阀杆开启或关闭行程相对较短，并具有非常可靠的切断动作 RETZ The axis of the stainless steel stop valve (throttle valve) stem is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve rod is relatively short, and it has a very reliable cut-off action

阀瓣一旦处于开启状况，阀座和阀瓣密封面之间就不再的接触，并具有非常可靠的切断动作，适合作为介质的切断或调节及节流使用 Once the valve clack is open, there is no contact between the valve seat and the sealing surface of the valve clack, and the valve clack has a very reliable cutting action, which is suitable for cutting off or regulating the medium and throttling

设计制造Design and Manufacture∶ BS1873 or ASME B16.34 

检验与试验 Inspection and Test∶ API 598 

法兰连接尺寸End flange dimension∶ ASME B16.5 

对焊端BWend dimension∶ ASMEB16.25

承插焊端 Socket-weld dimension∶ ASME B16.11 

结构长度Facetoface and end to end∶ ASME B16.10 

高压等级Pressure-temperatureratings∶ASMEB16.34

规格尺寸 Size : 1/2～12"

公称压力 Nominal pressure：PN16～100、CL150～600LB

适应温度 Applicable temperature ：-40～500℃

进口不锈钢法兰截止阀，节流阀结构特点 The Features

●阀杆设计Stem Design

采用整体锻造工艺制成，按照标准要求确定最小直径。The stem is of integral forged design. The minimum dianeter of the stem shall per the standard requirement.

●弹簧加载填料冲击系统Belleville Spring Loaded Packing Impacting System

如果客户要求，可采用弹簧加载填料冲击系统提高填料密封的持久性和可靠性 If being requested by the customer, the Belleville spring loaded packng impacting system can be adopted for enhancing the durability and reliability of the packing seal.

●上密封座设计Back Seating Design

RETZ的截止闭都有倒密封设计，通常情况下，碳钢截止阀的阀座设计采用分离式倒密封结构，不锈钢截止阀密封是直接加工或者是焊后加工。当阀门在全开位置时，倒密封的密封面非常可靠。虽然按照标准API600中有倒密封，但这不作为在带压情况下更换填料的依据。

All our globe valves have the back seating design. In most cases, the carbon steel globe valve is fitted with a renewable back seat. For stainless steel globe valve, the back seat is machined directly in the bonnet or is machined after welding. When the globe valve is at fully open position, the sealing of the back seat can be very reliable. However, as pelthe requirement of API, it is not advisable to add or change packing by the mean of back seating when the valve is pressure containing.

●阀座Seat

碳钢截止阀阀座通常采用锻钢材料，阀座密封面可根据客户要求喷焊硬质合金，NPS≤101的截止阀采用分离式螺纹旋入式阀座，如果用户需要焊御座结构也可提供；NPS》12'载上阀采用焊御座结构；不锈钢截止阀的阀座一般采用整体式或者在本体上焊硬质合金后直接加工阀座。如果用户有需求，不锈钢截止阀阀座也可采用分离式螺纹旋入式和焊接阀座结构。

For carbon steel globe valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the custorner. Renewable threaded seat is used for NPS 4 10 alobe valves, and vwelded on seat can be also optional if being requested by the customer, Welded on seat is used for NPS≥12 carbon steel globe valves. For Staiinless steel globe valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel globe valve if being requested by the customer,

●阀杆螺母StemNut

通常情况下，阀杆螺母材料采用ASTM A439 D2，同时可以根据用户要求采用铜合金等材料，对于大口径的截止阀，装滚动轴承，可以有效减小截止阀的开启力矩使阀门可以轻松开关。

Usually, the stem nut is made of ASTM A439 D2, it is also can be rnade of copper ally if being requested by the customer. For large sized globe valve, rolling bearing is fitted at the two sides of stem nut in order to minimize the open and close torque of the globe valv

●填料密封PackingSeal

通常采用成型柔性石墨作为填料材料，可根据用户需求提供PTFE或者复合填料材料。填料与填料函接触的表面粗糙度为3.2μm，可以保证阀杆与填料接触面接合紧密但是旋转自如，经过精密的机械加工的阀杆密封面粗糙度0.8μm，可以保证阀杆可靠的密封。

Molded flexible graphite is used for packing material. PTFE or combineld packing material can be also used if being requested by the customer. The internal surface of the stuffing box, of which area is contacted with'the packing, is of excellent finish(Ra 3.2 u m). The stem surface, contacting with the packing, should be rolled and pressed after being precisely maachined, so as to reach to the high finish and compactness(Ra 0.8 u m)and ensure the relizble tightness of the stem area.

主要零部件材料 Main parts and materials