SUN DPBC-LAN exhaust valves from the USA are in stock.

Brand

SUN/USA

Application Areas

Chemical, Petroleum, Energy, Electrical, General

SUN air vent valves are used to remove air from systems to reduce starting power and accelerate pump start-up in neutral shut-off circuits.

1: Air venting and starting valves require a minimum flow rate of 4 gpm (15 L/min) and a system pressure of 80 psi (5.5 bar).

2: The valve will reopen when the system pressure drops below 25 psi (1.7 bar).

3: After air is vented, the closing time varies from approximately 12 seconds at 4 gpm (15 L/min) to approximately 0.5 seconds at 50 gpm (200 L/min).

4: Sun's floating design minimizes interference caused by excessive installation torque and machining errors in the bore.

Features of SUN Air Vent Valves:

1. The float of the air vent valve is made of low-density PPR and composite materials, which will not deform even after prolonged immersion in high-temperature water. This prevents difficulty in float movement.

2. The float lever is made of rigid plastic, and the connections between the lever, float, and support are all movable, preventing corrosion during long-term operation and thus avoiding system malfunction and leakage.

3. The sealing end of the lever is spring-supported, allowing it to expand and contract with the lever's movement, ensuring a tight seal even when air is not released.

Installation: It is best to install the air release valve together with the isolation valve. This ensures a tight system seal and prevents water leakage when the air release valve needs to be removed for maintenance. The low-density PP material will not deform even after prolonged immersion in high-temperature water.

Operating Instructions for SUN Air Vent Valve (USA):

When water begins to flow into the pipe, the plug remains in the open position to allow for significant air release. Once all air is released, water accumulates inside the valve, causing the float to rise and move the plug to the closed position, stopping the significant air release. When water is flowing normally through the pipe, if a small amount of air accumulates inside the valve to a certain extent, the water level drops, causing the float to descend as well. At this point, the air is released through the small orifice. When the pump stops, the water in the pipe dries up, or negative pressure is generated in the pipe, the plug quickly opens to draw in air, ensuring the pipeline is secure.

Technical Requirements for SUN Air Vent Valve (USA):

① Main Technical Parameters

a. Nominal pressure of the air vent valve: PN10.

b. Sealing test pressure: 1.1 MPa.

c. Strength test pressure: 1.5 MPa.

d. Water shut-off pressure of the air vent valve: ≤0.02 MPa.

e. Air shut-off pressure of the air vent valve: ≥0.07 MPa.

f. Pressure test shall comply with the provisions of standard GB/T13927. g. The connecting flange shall conform to the provisions of standard GB/T17241.6-98.

h. The maximum working pressure can reach 10 bar.

i. The maximum working temperature (water) is approximately 110℃.

② Performance Requirements

a. The air vent valve should have a large air venting capacity, enabling rapid air venting and restoration to normal water supply capacity in a very short time when the pipeline is filled with water from an empty pipe.

b. When negative pressure is generated in the pipe, the piston of the air vent valve should be able to open quickly and rapidly draw in a large amount of outside air to ensure that the pipeline is not damaged due to negative pressure. It should also be able to expel any small amount of air accumulated in the pipeline under working pressure.

c. The air vent valve should have a relatively high air closing pressure, with sufficient capacity to completely expel air from the pipeline in a short time before the piston closes, improving water delivery efficiency.

d. The water closing pressure of the air vent valve should not exceed 0.02 MPa, allowing the air vent valve to close under relatively low water pressure, thereby preventing a large outflow of water.

e. The air vent valve should use a stainless steel float (float) as the opening and closing element. f. The air vent valve body should be equipped with an anti-impact protective inner cylinder to prevent premature damage to the float (float) caused by the high-speed water flow directly impacting it after a large amount of air is released.

g. For air vent valves with DN≥100, a split structure should be adopted, consisting of a large air vent valve and an automatic air vent valve, to adapt to the pipeline pressure requirements. The automatic air vent valve should use a double lever mechanism to significantly amplify the buoyancy of the float, and with a low closing water level, impurities in the water are less likely to contact the sealing surface, preventing blockage of the air vent and greatly improving its anti-clogging performance. Simultaneously, under high pressure, the force amplification effect of the double lever allows the float to descend synchronously with the water level, preventing the opening and closing parts from being sucked in by high pressure like in traditional valves, thus ensuring normal air release.

h. For high flow rates, frequent pump starts, and DN≧100 diameter applications, a buffer plug valve should be installed on the air vent valve to mitigate water flow impact. The buffer plug valve should prevent large amounts of water spray without affecting large amounts of air release, ensuring that water delivery efficiency is not affected and effectively preventing water hammer. [1] Working Principle of SUN Air Vent Valve (USA)

When gas overflows from the system, it rises along the pipes and eventually accumulates at the highest point of the system. Air vent valves are typically installed at the highest point. When gas enters the valve chamber and accumulates at the top, the pressure increases as the gas volume rises. When the gas pressure exceeds the system pressure, the gas causes the water level in the chamber to drop, causing the float to drop with the water level, opening the vent. After the gas is exhausted, the water level rises, and the float rises, closing the vent. Similarly, when negative pressure is generated in the system, the water level in the valve chamber drops, and the vent opens. Since the external atmospheric pressure is greater than the system pressure, atmospheric pressure enters the system through the vent, preventing the harmful effects of negative pressure. Tightening the valve cap on the valve body stops the air vent. Normally, the valve cap should be in the open position. Air vent valves can also be used with isolation valves for easy maintenance. DAAL-MCV-4E24V

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DAAL-MCV-948 The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, Vickers, Helón (Norgren)

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi