Self Actuated Upstream Downstream Pressure Control Valve
Self Actuated Upstream Downstream Pressure Control Valve uses the itself energy of the controlled medium as the power source, introduces the actuator to control the position of the valve plug to change the flow area, and changes the pressure difference and flow rate at both ends, so that the pressure at upstream or downstream of control valve is stabilized at a given value.
- Introduction
- Parameters
- Working Principle
- How to Order
Self Actuated Upstream Downstream Pressure Control Valve
BCST self actuated pressure control valve uses the itself energy of the controlled medium as the power source, introduces the actuator to control the position of the valve plug to change the flow area, and changes the pressure difference and flow rate at both ends, so that the pressure at upstream or downstream of control valve is stabilized at a given value. The self actuated upstream or downstream pressure control valve is used for the occasions where there is no power supply, gas supply and needs to control. It has the advantages of sensitive action, good sealing performance and small pressure fluctuation. It is widely applied in various industrial equipments for automatic control of decompression and pressure regulation of gas, liquid and vapor medium.
The self actuated downstream pressure control valve is the valve that controls the pressure at downstream and the valve action type is press-to-close type. The principle is as follows:
The medium flows through the valve body in the direction of the arrow on the valve body. The interception area between the valve plug (No.2) and the valve seat (No. 1) determines the medium flow. The controlled downstream pressure (P2) is transmitted to the sensing element via the pressure guiding tube (No.20), the condenser (No.18) (used when the medium is steam) and globe valve (No.19), and is converted into a positioning force. The positioning force adjusts the position of the valve plug according to the spring force. The spring force is adjusted by the pressure regulating disc (No.6).The fully balance valve is provided with a balance bellows (No.8), and the downstream pressure P2 acts on the inner surface of the bellows, and the upstream pressure P1 acts on the outer surface of the bellows so that the pressures P1 and P2 acting on the plug are balanced with each other.
When the downstream pressure is greater than the adjusted set point, it compresses the spring and drives the plug, and then the valve opening is proportionally reduced according to the amount of pressure change. When the downstream pressure is lower than the set point, the valve plug is driven by the reaction force generated by the spring, so that the valve opening degree is proportionally increased according to the pressure change, thereby achieving the purpose of pressure reducing and stabilizing.
Technical Parameter
1.Plug Type: single-seat/cage guided/double-seats;
2.Action Type: downstream pressure regulating(B type),upstream pressure regulating(K type);
3.Nominal Diameter: DN15mm〜300mm(1/2”〜12”);
4.Flow Characteristics: Quick Opening;
5.Regulating Accuracy: ±3~10%;
6.Application Temperature: ≤350℃;
7.Pressure Reducing Ratio: max ratio is 10, and min ratio is 1.25;
8.Nominal Pressure:PN16,PN25,PN40,PN63,PN100,Class150,Class300,Class600;
9.Connection Type:flanged,welding,thread;
10.Body and Bonnet Material:WCB,WC9,CF8,CF8M;
11.Actuator Type:diaphragm type,piston type,bellows type;
12.Packing:PTFE , Flexible graphite;
13.Surface Coating:silver gray (epoxy resin);when the valve body is stainless steel,it is not coated.
Working Principle of Self Actuated Upstream Downstream Pressure Control Valve
1.Self Actuated Pressure Downstream Control Valve:
The self actuated downstream pressure control valve is the valve that controls the pressure at downstream and the valve action type is press-to-close type. The principle is as follows:
The medium flows through the valve body in the direction of the arrow on the valve body. The interception area between the valve plug (No.2) and the valve seat (No. 1) determines the medium flow.The controlled downstream pressure (P2) is transmitted to the sensing element via the pressure guiding tube (No.20), the condenser (No.18) (used when the medium is steam) and globe valve (No.19), and is converted into a positioning force.The positioning force adjusts the position of the valve plug according to the spring force.The spring force is adjusted by the pressure regulating disc (No.6).The fully balance valve is provided with a balance bellows (No.8), and the downstream pressure P2 acts on the inner surface of the bellows, and the upstream pressure P1 acts on the outer surface of the bellows so that the pressures P1 and P2 acting on the plug are balanced with each other.
When the downstream pressure is greater than the adjusted set point,it compresses the spring and drives the plug, and then the valve opening is proportionally reduced according to the amount of pressure change. When the downstream pressure is lower than the set point, the valve plug is driven by the reaction force generated by the spring, so that the valve opening degree is proportionally increased according to the pressure change, thereby achieving the purpose of pressure reducing and stabilizing.
2.Self Actuated Pressure Upstream Control Valve:
The self actuated upstream pressure control valve is the valve that controls the pressure at upstream and the valve action type is press-to-open type. The principle is as follows:
The controlled upstream pressure (P1) is transmitted to the sensing element via the pressure guiding tube (No.20), the condenser (No.18) (used when the medium is steam) and globe valve (No.19), and is converted into a positioning force.The positioning force adjusts the position of the valve plug according to the spring force.The spring force is adjusted by the pressure regulating disc (No.6).The fully balance valve is provided with a balance bellows (No.8), and the downstream pressure P2 acts on the inner surface of the bellows, and the upstream pressure P1 acts on the outer surface of the bellows so that the pressures P1 and P2 acting on the plug are balanced with each other.
When the upstream pressure is greater than the adjusted set point,it compresses the spring and drives the plug, and the valve opens,then the valve opening increases proportionally with increasing pressure. When the upstream pressure reduces,the force acting on the detecting element is reduced. Under the reaction force of the spring, the valve plug is driven to reduce the valve opening, and the valve is closed when the pressure is lower than the pressure setting value, thereby achieving the purpose of pressure reducing and stabilizing.
Pressure set point can be adjusted on the spot within the pressure regulating range;
| DN(mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |
| Rated Flow
Coefficient Kv |
Single-seat | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | ||
| Cage | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | |||
| Double-seats | 22 | 33 | 53 | 83 | 132 | 209 | 330 | 528 | 836 | 1210 | 1925 | |||
| Rated Travel(mm) | 8 | 10 14 | 20 | 25 | 40 | 50 | 60 | 70 | ||||||
| Pressure Regulating
Range(kPa) |
15~50 40〜80 60~100 80~140 120~180 160~220 200~260 240~300 280~350
330〜400380〜450 430〜500 480〜560 540〜620 600〜700 680〜800 780-900 880-1000 950〜1100 1080~1250 1230〜1400 1380〜1550 1530〜1800 1780〜2000 1980〜2300 2280〜2500 |
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How to order
1. Model and Name
2.DN(mm) Diameter
3.Working pressure
4.Flow Characteristic
5.Body material
6.Rate Flow rate Factor
7.Medium and working temperature
8.Inlet and outlet pressure (differential pressure )
9.Control signal
10.Other special requirement
Video for Self Actuated Upstream Downstream Pressure Control Valve
