Check valves are used to stop backflow inside a piping system. Check valves are uni-directional valves that, as long as the flow pressure is steady, allow unhindered flow in one direction while safeguarding the piping system from reverse flow. Ball, piston, as well as stop check valves are the three primary types of check valves we provide.
Piston Check Valves
Piston check valves, another member of the lift check valve family, use a weighted piston (or disc) to stop backflow. These work similarly to ball check valves, permitting flow while flow pressure is constant but applying gravity closure when flow pressure falls below the point at which it is no longer strong enough to raise the valve.
The valve bore keeps the piston aligned and directs it throughout its course. Piston check valves may or may not have spring support to aid in closure, depending on the flow circumstances. Typical scenarios where piston check valves are used include:
- Control of feed water in the nuclear industry
- Drain lines
- Makeup solution
- Systems of various processes
- N2 platforms
- Systems for monitoring as well as sampling.
Valves For Ball Check
Lift check valves called ball check valves allow flow while preventing backflow by using a weighted ball as opposed to a disc. The ball rises from its seat after the cracking pressure has been reached, enabling flow to start. It snaps back into position to avoid backflow when the flow pressure drops.
When high-pressure as well as high-velocity flows are necessary and backflow could harm items upstream, ball check valves are used.
Stop Check Valves
Stop check valves blend the advantages of globe valves’ positive closing capability with those of lift check valves. These qualities make it possible to control flow in any direction. Stop check valves’ primary function is to guard against harm to pump or boiler systems that are located upstream of the valve in the piping system. Typical use cases for stop check valves are including:
- Steam heat recovery
- Service at high temperatures
- Thermal service
- Service for high-pressure safety
- System safety for utilities
- Cut off the cooling
- Production and refinement of petroleum
- Processing of hydrocarbons
What are some check valve benefits and drawbacks?
A check valve’s main benefit is that it prevents reverse flow while often not requiring any external activation. Additionally, they offer a quick fix for stopping backflow. One or more restrictions on the valve’s installation configurations, the inability to assess the valve’s health and condition, and the potential for the valve to stick in the open position are some drawbacks (not often a problem associated with ball and piston types).
How can failure of check valves be avoided?
The difficulty of knowing the condition of the enclosed valve is one of the drawbacks of check valves. As a result, there are certain steps that must be taken to identify and avoid their failure. Valve chattering (shaking), recorded reverse flow, extreme component wear, audible permeability indicators (water hammer), and leaking are a few signs of failure or prospective failure. Failure can be avoided by:
- Suitable sizing
- Regular checks for cleanliness
- A suitable installation
- Changing valves as necessary.
Where do check valves get their use?
Check valves are employed in a variety of settings. For instance, they are frequently installed on a pump’s outlet side to prevent backflow. Check valves are crucial for maintaining water pressure in the pipes since centrifugal pumps, the most prevalent kind of water pumps, are not self-priming. Additionally, check valves are utilized frequently in HVAC systems (Heating, Ventilating and Air Conditioning-systems). High rises, in which a coolant is pushed many stories up, employ HVAC systems as an example. To ensure that the coolant does not flood back down, check valves have been fitted here.
Choosing a check valve: a few things to think about
It’s crucial to consider the system’s costs and benefits while selecting a check valve. The goal is frequently to cut costs while also achieving the lowest pressure loss feasible, yet with check valves, greater safety equates to greater pressure loss. The risk of water hammer, the acceptable level of pressure loss, and the cost of installing a check valve with an excessive safety margin against water hammer must all be taken into account when determining whether a check valve would effectively safeguard a system.
Where to find the best check valves?
Yuhuan Hongda Sanitary Ware CO., Ltd. was established in 1996 and is situated in Chumen Town, Yuhuan City, Zhejiang Province, on China’s east coast. The business manufactures a variety of brass valves, balls, pipe fittings, and bibcocks. The organization currently employs 150 people across a 6,700 square meter space, including 30 different sorts of technical management professionals. The company’s yearly output value is 70 million yuan, and its registered capital is 4 million.
Brass check valves of all types are manufactured by Yuhuan Hongda Plumbing Co., Ltd. The brass spring return check valve, swing check valve, foot valve, Y Strainer, as well as brass check valve with strainer are all part of their brass none return valve collection. Their check valve is constructed of forged brass and used extensively in plumbing, pumping, including pipelines to prevent overflow of the liquid control system
