TL series shrouded control valve
key word：Heat exchange element
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Product description
TL series shrouded control valve
1. Introduction
1.1. Purpose
The shrouded control valve is mainly used in the flow regulation occasions of medium and low pressure difference, and is widely used in the flow regulation of overhead, low rack, deaerator, make-up water, condensate, feed water and other systems of power plant.
1.2. Model meaning
T**##&&-$$@@/※※
T - control valve code
**----M is labyrinth type; K is orifice plate type; Y is cone type; L is shrouded type
##-------D is electric; Q is pneumatic; Y is hydraulic
&&---------1 represents balanced spool; 2 represents unbalanced spool; 3 represents pressurized spool
$$--- nominal pressure (MPa)
@@--------------Valve body material (see table 34-1 for specific code)
※※----------Nominal diameter (mm)
Table 34-1 material code of valve body
| Valve body material | Code |
| Grey cast iron | Z |
| Mallable iron | K |
| nodular cast iron | Q |
| Copper and copper alloys | T |
| Carbon steel | C |
| Cr Ni Ti steel | P |
| Cr Mo alloy steel | I |
| Cr Mo V alloy steel | V |
1.3. Structural features
The valve with shrouded structure is composed of valve cover, valve body, shrouded valve stem and other parts. After the valve is assembled, it is convenient to repair and replace the internal parts. At the same time, the inherent flow characteristics of the valve can be changed by replacing different parts. In addition, the main features of the shrouded control valve are: 1) line contact sealing, good closing performance; 2) hardmetal surfacing on the sealing surface.
2. Main technical parameters and product appearance
2.1. Main technical parameters (see table 34-2)
Table 34-2 main technical parameters of TL series shrouded control valve
| Item | Parameter |
| Nominal pressure（MPa） | 0～75（4500 Poung grade） |
| Nominal diameter (mm) | 20～500 |
| Applicable units | 50～1000MW units |
| Rated flow (t/h) | 0～3600 |
| Working temperature（℃） | ≤620 |
| Working medium | Water, steam, corrosive medium |
| characteristic curve | Linear, equal percentage, corrected equal percentage or other |
| Connection form of inlet and outlet | Flange connection or butt welding connection |
| Supporting actuator | Electric, pneumatic or other |
2.2. Product appearance (see figure 34-1)
3. Selection method
Generally, the selection of valves can refer to the recommended valve structure and type to determine the main technical conditions of the valve. According to the regulation requirements and the working temperature, pressure, density, noise and other conditions of the medium, not only the flow characteristics and flow coefficient should be considered For the inherent static characteristics of valves such as CV or KV, allowable pressure difference and regulation range R, the influence of the dynamic characteristics such as the distortion of flow characteristics caused by the changes of system resistance and operating conditions due to the different parallel and series positions of the valves installed on the actual pipeline must also be considered.
4. Scope of supply and general technical specifications
4.1. Scope of supply
It includes the valve body and the actuator matched with the valve. Other accessories, such as interface pipe, reducing joint, etc. are selected according to the user's requirements.
4.2. General technical specifications
Valve product design reference standard:
Valve product design reference standard:
ASTM A182 / A182M-2008 Forged or rolled alloy steel nominal pipe flanges, forged pipe fittings, valves and parts for high temperature service
ASME B16.34-2004 Flanged, threaded and welded valves
ASME B16.10-2000 Valve structure length
ASTM A370-2003a Definite and test method for mechanical properties of steel products
ASTM A-388 / A 388M-2004 Standard Practice for ultrasonic inspection of heavy steel forgings
GB / T12224-2005 General requirements for steel valves
GB / T 10868-2005 Desuperheating and pressure reducing valve for power station
GB / T 13927-1992 General purpose valve pressure test
GB / T 5097-2005 Non destructive testing, penetrant testing and magnetic particle testing observation conditions
GB / T 19672-2005 Specification for pipeline valves
