Gate Valves
Gate valves are primarily designed for on-off services when a straight-line flow of fluid and minimum restriction is desired. The closure member of gate valves either stops or allows flow through the valve and acts somewhat like the opening or closing of a gate and is called, appropriately, the gate valve.
The gate is also shown as a wedge, due to the shape is resembles. When the valve is open, the closure member is fully drawn up into the valve, leaving a complete opening for the flow stream. Therefore, there is little pressure drop or flow restriction through the valve. Gate valves are used in many industrial applications including the oil and gas industry, pharmaceuticals, manufacturing, automotive, and marine. Gate valves are not suitable for throttling purposes.
“T”- Pattern Globe Valves
Globe valves are used for flow regulation, frequent operation, increased flow resistance or for positive shut off when closed. Globe valves are closing-down valves in which the closure member is moved squarely on and off the seat. By this mode of disc travel, the seat opening varies in direct proportion to the travel of the disc. This proportional relationship between valve opening and disc travel is ideally suited for duties involving regulation of flow rate. Globe valves can also be used for on-off duty, the seating load can be positively controlled with high sealing capacity.
The change in direction of fluid flow through these valves produces increased resistance and pressure drop. The standard Straight “T”-Pattern valve body is the most common, but because of its tortuous flow passage it offers the highest resistance to flow of the patterns available. Globe valves are used in many industrial applications including the oil and gas industry, pharmaceutical, manufacturing, automotive, and marine. Globe valves are also recommended for services requiring frequent operation and positive shut off.
“Y”- Pattern Globe Valves
Globe valves are used for flow regulation, frequent operation, increased flow resistance or for positive shutoff when closed. Globe valves are closing-down valves in which the closure member is moved squarely on and off the seat. By this mode of disc travel, the seat opening varies in direct proportion to the travel of the disc. This proportional relationship between valve opening and disc travel is ideally suited for duties involving regulation of flow rate. Globe valves can also be used for on-off duty, the seating load can be positively controlled with high sealing capacity.
The change in direction of fluid flow through these valves produces increased resistance and pressure drop. The oblique pattern globe-valve body is designed to reduce the flow resistance of the valve to a minimum. This valve combines low flow resistance for on-off duty with the robustness of globe-valve seatings. Globe valves are used in many industrial applications including the oil and gas industry, pharmaceutical, manufacturing, automotive, and marine. Globe valves are also recommended for services requiring frequent operation and positive shut off.
Swing Check Valves
Swing check valves, like all check valves, are used to prevent back flow in the line. The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. The swing check valve functions by allowing flow forces to move the closure element, it is a hinged clapper which swings or rotates around a supporting shaft.
The disk swings away from the valve-seat to allow flow in the forward direction, and returns to the valve-seat when upstream flow is stopped, to prevent backflow.
Swing check design is one of the most common and best check valve for general-purpose use. These valves produce the lowest pressure drop, when compared with other check valves of the same size, the internal contours and shapes allow them to fully open at low fluid velocities and create a smooth flow path through the valve.
The design is simple and easy to maintain and can be used for either horizontal or vertical (fluid flowing upward) pipe layouts. Because of their design, swing checks are not fast-closing valves due to the travel distance from full open to close.
Piston & Ball Check Valves
Piston and ball check valves, like all check valves, are used to prevent back flow in the line. Standard valve design has no spring in order to minimize cracking pressure and pressure drop, it will only function properly when installed in a horizontal line. As an option the designs can include a spring to assist closing and for use in 90-degree styles installed in vertical lines.
PISTON CHECK VALVE
The pressure of the fluid passing through a system opens the valve, while any reversal of flow will close the valve. In Piston, or lift, check valves a body-guided disc moves within the body bore. The body guide ensures alignment of the seat and disc when the valve closes. The valve is installed with the flow under the disc, so that the inlet line pressure and flow rate will force the disc to “lift” off the seat and allow the line fluid to flow through the valve. Should the flow suddenly reverse itself, the disc will automatically ahttp://www.bfe.it/products-forged-alternative-design-solutions.phpnd quickly, assisted by the weight of the disc, be forced to the closed position, preventing the line fluid from returning. Exercise caution when these valves are used for dirty media because that media could cause the disc to stick inside the body bore.
BALL CHECK VALVE
The function of ball check valves is similar to the piston check, but the ball check valves use a “ball” inside the body to control the movement of flow.
The ball is free to rotate, resulting in even wear and a wiping action between the ball and seat. This feature makes ball checks useful for viscous media.
Alternative Design Solutions
There are a large variety of available valves and valve configurations for a wide variety of purposes and conditions that are not covered in detail here. Some example are listed below. Other valve designs or customised configurations are available on request. Contact us for special requirements.
- Wafer, Wafer x NPT, Flanged x NPT
- Angle Pattern Globe Valves
- Bonnet Less Valves
- Angle Pattern Piston & Ball Check Valves
- «Y» Pattern Piston & Ball Check Valves
- Union Bonnet Valves
| Range | Availability |
| Size | 1/4″-2″ (some valves available in 3″) |
| Pressure | 150#- 4500# – including class 800 |
| Ends | SW, Threaded, BW, Flanged, Hub, Compact flange |
| Materials | CS- SS- Duplex- SuperDuplex- 6Mo- Al. Bronze |
