What is a valve manifold? The valve manifold used to protect the DP transmitter from higher range. This device isolates the transmitter from fluid pressure for calibration and for maintenance purposes. The manifold is a combination of valves in a single body. Each valve will have separate openings ad controls. The manifolds commonly use the …
What is valve manifold? – 3 valve and 5 valve manifolds Read More »
Introduction We have learned that valves are used to either shut-off flow, change the flow path or throttle flow, and that valves are characterized by how their flow coefficient varies with relation to closure member position, but valves are typed according to the motion of their closure member. The two types of control valves are …
What is valve sizing & it’s importance? The valve sizing can be defined as picking the right size valve for the job or, in certain instances where a valve size is predestined, the correct trim size. Valve sizing procedures are based on accepted mathematical equations that are used to model flow through ideal restrictions such …
Control valve sizing – Equations & its importance Read More »
Introduction The Control Valves consist of the single-seated  Angle Valve and  Pneumatic Actuator.The process medium flows through the valve in the direction indicated by the arrow. The position of the plug (3) is changed by the signal pressure acting on the diaphragm in the actuator (8).The plug stem (6) and plug are connected to the actuator stem (8.1) by the stem connector (7). …
How to assemble a diaphragm actuator to the control valve? Read More »
Sliding-Stem Valves Sliding-stem valves include globe valves, angle valves, and axial flow valves. Of all the control valve types, the sliding-stem, globe style valve is the most common. As shown in Figure , the major components of a sliding-stem, globe style valve include the valve body, bonnet, trim, gaskets, and packing. Valve Body –The valve body is the main fluid boundary and pressure …
Difference between Rotary-Shaft Valves & Sliding-Stem control Valves Read More »
The final control elements perform their functions according to the commands of this control room. A self-regulated valve adjust the flow using the fluid flow pressure in the pipe. Then, the self-regulated valve receives its energy directly from the controlled system, so the amount of control is limited. However, the structure is simple and economical, …
Valve vary the flow of fluid through it by means of the change of pressure to the valve top. The relation between valve stem position and flow through the valve is known as valve characteristics. The amount of fluid passing through a valve at any time depends upon the opening between the plug and seat. …
In this session we are gonna discuss about how to select a control valve actuators and we will briefly talk about it’s criteria What is a control valve actuator? The control valve regulates the rate of fluid flow as the position of the valve plug or disk is changed by force from the actuator. How …
Introduction Pneumatically operated control valve actuators are the most popular in use, but electric, hydraulic and manual Actuators are also widely used. The pneumatic spring and diaphragm actuator is most commonly specified due to its reliability and simplicity of design. Pneumatically operated piston actuators provide high stem output power for demanding service conditions. The adaptations …
Introduction in this session we are gonna discuss about the parts of control valves DIAPHRAGM CASE Use to enclose the diaphragm to form a pressure chamber, one above the diaphragm and one at the bottom of the diaphragm. The sealing surfaces of the slope away from the diaphragm at the outer edge to insure a pressure …