旁路阀系列 Bypass valve series
DC3700 旁路减温减压阀 DC3700 bypass desuperheater
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.
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).
≤PN100 (ANSI CLASS600): bolted flange bonnet
>PN100 (ANSI CLASS600): Pressure self-tightening bonnet
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
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.
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.