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旁路阀系列 Bypass valve series
DC3700 旁路减温减压阀 DC3700 bypass desuperheater
DC3700系列蒸汽减温减压站（PRDS）为汽轮机旁路系统通用和紧凑型的蒸汽减温减压方案，包括高压及低压旁路。
锻造球形阀体及高质量的构造材质，拥有比传统型更均匀的壁厚，高质量的阀体焊接，P/T疲劳效应小。
东辰所有减温减压站的检测符合TRD 301规范,并满足至少2000次冷启动和10000次热启动循环。
蒸汽减压主要由两级实现：第一级，钻孔套筒阀芯调节流量；第二级设计为固定的调节区域，有双重作用：一，降低流速及噪音声压等级，对第一级产生背压；二，控制混合腔内的蒸汽速度及分布，优化降温过程。
第二级可作为消音器具有吸收声能的功能，减小第一级产生的噪音。多级笼式消音器的间隙优化到可以将噪音频率降到1kHz－4kHz，或使用特殊设计的盘片堆栈作为消音器时，可产生更显著的吸声性能。
减温段直接一体式布置于第二级的下游，由蒸汽混合腔装配喷嘴或东辰不同的喷水减温器构成。减温段的选择必须按照运行工况、工厂布局和过程控制需求来进行。消音器的设计可使其下游混合腔内的蒸汽产生一定的速度保证减温效率，下游一体式喷水减温可以防止由于热冲击对阀芯和主阀体的破坏。
应用：
DC3700系列蒸汽减温减压站是蒸汽调节领域优质解决方案，它整合了高性能流量控制及高效一体式蒸汽减温性能。
DC3740系列主要的应用场合是汽轮机旁路系统，其应用不受实际的压力、温度和流量限制。
大量的应用经验铸就了所采用的阀内件能够很好的减小磨损，更能够满足需要极少维护的连续运行场合。
东辰的各种减温喷水结构可以装配在合适的蒸汽调节场合，为不同的蒸汽流量工况提供足够的减温水，且拥有极高的可调比。
东辰拥有各种不同的降噪音解决方案（包括特殊设计迷宫式盘片堆栈），因此可满足任何适当的噪音要求。
对于需要大量减温水的连续蒸汽降温场合，可以装配各种不同的喷水混合腔，且喷水混合腔内置保护衬管防止管路损坏。
DC3700系列适合现场不能布置直通管路的场合。
标准配置的执行机构为电动执行机构或单作用、弹簧复位、气动薄膜执行机构，可配置气缸执行机构、定位器和其它用于快速动作或紧急动作的相关附件。
液动执行机构或电液执行机构也可以按照要求配置。
application:
The DC3700 Series Steam Desuperheater is the best solution for steam conditioning, combining high performance flow control with efficient integrated steam desuperheating.
The primary application for the DC3740 series is the turbine bypass system, whose application is not limited by actual pressure, temperature and flow.
A large number of application experience has resulted in the use of trims that reduce wear and tear, and to meet continuous operation where minimal maintenance is required.
DOCN's various desuperheating spray structures can be fitted in suitable steam conditioning applications to provide adequate desuperheating water for different steam flow conditions with an extremely high ratio of adjustment.
DOCN has a variety of noise reduction solutions (including the limiphon labyrinth disc stack) to meet any appropriate noise requirements.
For continuous steam cooling where a large amount of desuperheating water is required, a variety of different injection composite chambers can be assembled, and a protective lining is built in the injection composite chamber to prevent damage to the pipeline.
The DOCN series is best suited for applications where straight-through piping cannot be placed on site.
The standard actuators are electric actuators or single-acting, spring-return, pneumatic diaphragm actuators with configurable cylinder actuators, positioners and other accessories for quick action or emergency action.
The hydraulic actuator or electro-hydraulic actuator can also be configured as required.
HP高压至IP中压旁路阀DC3745
设计特点：
阀体：
锻焊阀体，阀体入口段及出口一体式喷水混合管采用焊接连接
阀体尺寸根据实际工况计算选定
压力等级：PN16~PN760（ANSI CLASS150~4500）。
阀盖：
≤PN100（ANSI CLASS600）：螺栓连接法兰阀盖
＞PN100（ANSI CLASS600）：压力自紧密封阀盖
阀内件：
套筒导向，先导平衡式阀芯
第一级减压由特制钻孔套筒实现
阀座由套筒压紧或者由带螺纹的压环压紧
消音器：
有三种不同的设计方案：
1~3级低噪音笼式结构
高效消音器结构
特殊设计迷宫式盘片堆栈结构
消音器通常与阀体焊接连接，当使用可拆式阀座时，消音器也可以设计在阀座上。
Design Features:
Valve body:
Forged valve body, valve body welded connection inlet section and outlet integrated water jet composite cavity
The valve body size is selected according to the actual working conditions.
Pressure rating: PN16~PN760 (ANSI CLASS150~4500).
cap:
≤PN100 (ANSI CLASS600): bolted flange bonnet
>PN100 (ANSI CLASS600): Pressure self-tightening bonnet
Valve trim:
Sleeve-guided, pilot balanced spool
The first stage of decompression is realized by a special drilling sleeve
The seat is pressed by the sleeve or pressed by a threaded press ring
silencer:
There are three different design options:
1~3 low noise cage structure (diffuser)
Efficient sound-absorbing structure
Special design labyrinth disc stack structure
The silencer is usually welded to the valve body when using a detachable seat
The silencer can also be designed on the valve seat.
IP中压至LP低压旁路阀DC3745
规格
The DC3700 Series Steam Desuperheating and Reducing Station (PRDS) is the most versatile and compact steam desuperheating solution for steam turbine bypass systems, including high pressure and low pressure bypass.
Forged spherical valve body and high-quality construction material, with a more uniform wall thickness than the traditional type, high-quality valve body welding, P / T fatigue effect is small.
All DOCN desuperheating and decompression stations are tested to TRD 301 and meet at least 2000 cold starts and 10,000 hot start cycles.
The steam decompression is mainly realized by two stages: the first stage, the drilling sleeve valve core regulates the flow rate; the second stage is designed as a fixed adjustment area, which has a dual function: one, reducing the flow rate and the noise sound pressure level, for the first stage Produce back pressure; Second, control the steam velocity and distribution in the composite cavity to optimize the cooling process.
The second stage can function as a silencer to absorb sound energy, reducing the noise generated by the first stage. The gap of the multi-stage cage muffler is optimized to reduce the noise frequency to 1 kHz to 4 kHz, or to use the Limiphon disc stack as a silencer to produce more pronounced sound absorption.
The desuperheating section is directly arranged in the downstream of the second stage, and is composed of a steam compound chamber assembly nozzle or a DOCN different water spray desuperheater. The selection of the desuperheating section must be based on operating conditions, plant layout and process control requirements. The silencer is designed to produce a certain speed of steam in the downstream composite cavity to ensure the efficiency of temperature reduction. The downstream integrated water spray can prevent the damage of the valve core and the main valve body due to thermal shock.