Check valves are used in many different applications. For example they are often placed on the outlet side of a pump, to protect the pump from backflow. Centrifugal pumps, the most common type of water pumps, are not self-priming, and therefore check valves are essential for keeping water in the pipes.
Can a ball check valve be installed vertically?
The principle of the ball check valve is very simple. The ball has sufficient weight to seat tightly even in high viscous liquid, but to open freely so that the headloss is minimal. Flomatic ball check valves can be installed horizontally or vertically provided that they are installed as the illustration shows.
Can a ball check valve be installed horizontally?
The Atomac ARV2 ball check valve will function properly in a horizontal application when installed correctly. First, ensure the pipe line is relatively level. (When installed horizontally the valve may not provide adequate back flow protection in a gas service).
What is the purpose of a ball type check valve?
A Ball Check Valve is a simple and reliable valve with the only moving part to block the reverse flow, is a spherical ball. The full-ported valve seat is uniquely designed allowing the ball to seat leak-tight without getting wedge into the valve seat.
When should check valves be used?
A check valve will be used commonly on the discharge of the pump to prevent backflow from the downstream system, when the pump shuts off. Check valves are also used to prevent contaminated media in branches from flowing back into the main trunk line.
Can a check valve be installed upside down?
Check valves MUST be installed with the valve’s FLOW arrow pointing in the direction of the flow. In horizontal installations, the designated side must be positioned “up”. Do Not install Check Valve upside down.
How do you check ball valve direction?
OPERATION. The valve handle is marked showing proper rotation direction for “ON” and “OFF” positions. Rotation is clockwise for “OFF” (closed) and counter clockwise for “ON” (open). You can control the flow by moving the lever between 0° and 90°.
How does a ball check valve work?
A ball check valve functions by means of a ball that moves up and down inside the valve. The seat is machined to fit the ball, and the chamber is conically shaped to guide the ball into the seat to seal and stop a reverse flow.
What is the function of a feed check valve?
Feed Check Valves are one of the most important components of boiler which control the flow of water from feed pump to the boiler and further prevents the backflow of water from boiler to pump when the boiler pressure is more than the pump pressure or when feed pump stops working.
What is a ball check valve used for?
Due to its simple flow efficient and virtually maintenance-free design the valve is commonly specified and used in submersible wastewater lift stations. Ball check valves contain a ball that sits on the seat, which has only one through-hole. The ball has a slightly larger diameter than that of the through-hole (seat).
What is the function of a ball seat in a valve?
In the closed position ball is pushed against the seat by the pressure of the fluid from upstream and hence can pressure seal the downstream of the valve. Ball seats on the downstream seat only. Seat loading increases at higher pressure and for larger size and becomes excessive, for soft seated valve.
What is the function of safety relief valve in ball valve?
An external safety relief valve is needed to allow the release of the cavity over-pressure due to thermal expansion. This double piston effect seat provides a more reliability in term of valve leakage. When the upstream ball valve seat fails then the upstream pressure will fill up the body cavity and energize the downstream ball valve seat.
What is the difference between SPE and Dib in ball valve?
This feature is available with self-relieving seat (SPE) configuration. If a ball valve has both seats as unidirectional (SPE) seats, it is called as Double Block & Bleed (DBB). If a ball valve has one or both bidirectional (DPE) seats, it is called as Double Isolation & Bleed (DIB).
