Flanged Swing Check Valve H44T

Flanged Swing Check Valve H44T Purpose

This valve is used mainly for water supply and drainage system and can be set on the pump outlet to prevent the pump from getting harmed by the medium back flow. it can also be set on the mouth of a water outlet pipe to prevent the medium from back flow.

Flanged Swing Check Valve H44T Definition and Components

What is an H44T Valve?

The H44T is a Flanged, Swing Check Valve. The designation follows a common pattern: H for Check Valve, 4 for Flanged End, 4 for the Swing Type design, and T indicating the seat material is a Copper Alloy (Bronze). It is a classic, simple, and reliable non-return valve where a disc swings on a hinge, opening with forward flow and swinging shut by gravity to block reverse flow.

Flanged Swing Check Valve Main Parts:

• Valve Body: A flanged, full-bore body, typically Y-pattern or angled, made of cast iron, ductile iron, or carbon steel.
• Cover (Bonnet): A bolted cover providing access to internal parts for inspection and maintenance.
• Disc (Flapper): The circular closure element, usually a flat or slightly convex plate made of iron, steel, or bronze.
• Hinge Arm & Pin: The lever arm connects the disc to the hinge pin, which is the pivot point mounted inside the body.
• Seat Ring: The machined sealing surface. For H44T, this ring is made of bronze, providing a good wear-resistant seal against the disc. It can be threaded or pressed into the body.
• Gasket: Seals the joint between the body and the cover.

Role, Characteristics, and Application Scenarios of Flanged Swing Check Valve H44T in Pipelines

Check Valve for Water  Funciones de canalización:

• Automatic Backflow Prevention: Allows fluid flow in one direction and automatically closes to prevent reverse flow.
• Full-Bore Flow: When open, the disc swings completely out of the flow path, offering minimal pressure drop.

Características operativas:

• Simple & Durable: Minimal moving parts make it robust and long-lasting with little maintenance.
• Gravity-Dependent Closure: Relies on the weight of the disc and gravity to close. Must be installed so the disc swing is horizontal.
• Potential for Water Hammer/Slam: In systems with rapid flow reversal, the disc can slam shut violently, causing noise, vibration, and pressure surges.
• Not for Pulsating Flow: Rapid flow fluctuations can cause premature wear from constant chattering of the disc against the seat.

Escenarios de aplicación:

Best for horizontal pipelines with relatively steady, non-pulsating flow.

• Water Supply & Distribution: In municipal water mains and pump discharge lines where space allows and flow is consistent.
• HVAC Systems: In building heating and chilled water circuits.
• General Industrial Services: For cooling water, process water, and other non-hazardous fluids.
• Low-Pressure Steam: In some steam return lines (with appropriate materials).

Diagrama del escenario (Descripción del texto):
In a city water treatment plant, clean water is pumped into the elevated distribution network. On the discharge side of each main pump, a horizontal pipeline is installed. An H44T Swing Check Valve is fitted into this horizontal line. When the pump runs, water pressure pushes the bronze-seated disc open, swinging it upward on its hinge. Water flows freely with little resistance. When the pump shuts down, forward flow stops. The weight of the disc causes it to immediately swing down by gravity, closing against the bronze seat ring and preventing the entire column of water in the distribution network from flowing backwards through the idle pump. Its simple design ensures reliable service for years with only occasional inspection.

Flanged Swing Check Valve Standards: Materials, Design, and Connections

Normas materiales:

• Body & Cover: Cast Iron (ASTM A126), Ductile Iron (ASTM A536), Carbon Steel (ASTM A216 WCB).
• Disc: Cast Iron, Carbon Steel, or Bronze.
• Seat Ring: Bronze (ASTM B62).
• Hinge Pin & Arm: Stainless Steel or Bronze.

Water supply valve types Normas de diseño:

• API 594: Check Valves: Flanged, Lug, Wafer, and Butt-welding. This is the primary design and testing standard.
• ASME B16.34: Valores nominales de presión y temperatura de las válvulas.
• MSS SP-71: Cast Iron Swing Check Valves

Normas de conexión:

Flanges: ASME B16.1 Class 125/250 (for iron) or ASME B16.5 Class 150 (for steel). Raised Face (RF) is typical.

Cómo seleccionar una válvula antirretorno de charnela con bridas

Pasos clave:

• Confirm Application Suitability: Ensure your application has steady flow and a horizontal installation orientation. Do not select it for vertical lines or systems prone to water hammer.
• Select Materials: The "T" (Bronze seat) offers good corrosion resistance for water services. For more corrosive fluids, specify a different trim (e.g., stainless steel seat and disc).
• Consider Water Hammer: If slam is a concern, consider an external lever/weight, a dashpot, or choose a different valve type (like a silent check valve).
• Check Dimensions: Swing check valves have a long face-to-face length. Verify the installation space and weight, as they are heavier than wafer check valves.

Pre-Shipment Inspection for Export Flanged Swing Check Valve and Key Considerations

Lista de comprobación de la inspección:

• Functional Swing Test: This is key. Hold the valve in its installed orientation (disc hinge horizontal). The disc must swing freely and fully open by its own weight when the valve body is tilted, and fall closed smoothly without sticking.
• Pressure Testing: Perform shell test and seat leakage test per API 594. For a metal-seated valve (bronze-on-metal), a slight weep per the standard is acceptable, but major leakage is not.
• Dimensional Check: Verify face-to-face length and flange dimensions/drilling against the order specification.
• Visual Inspection: Check for proper machining of the seat face and absence of defects in the disc sealing surface.

Precauciones para la exportación:

• Secure the Disc: Before crating, tie the disc in the fully closed position using wire or plastic straps. This prevents it from swinging violently during handling and damaging the hinge pin or seat.
• Protect Flange Faces: Use sturdy, bolted plastic or wooden covers on the flange faces to protect the sealing surfaces and bolt holes.
• Internal Preservation: Apply a light, removable anti-corrosion coating to internal metal surfaces, especially the disc and seat.
• Proper Packaging: Use a robust wooden crate. Due to the valve's asymmetric weight distribution (the disc and cover assembly), ensure it is blocked and braced to prevent movement. Mark the crate with "SWING CHECK VALVE" and "KEEP HORIZONTAL" handling instructions.

Flanged Swing Check Valve Main dimensions(mm)

DN	L	D	D1	D2	n-Фd	H	f	b
40	180	150	110	88	4-Ф19	114	3	19
50	200	165	125	102	4-Ф19	127	3	19
65	240	185	145	122	4-Ф19	137	3	19
80	260	200	160	138	8-Ф19	150	3	19
100	300	220	180	158	8-Ф19	164	3	19
125	350	250	210	188	8-Ф19	185	3	19
150	400	285	240	212	8-Ф23	205	3	19
200	500	340	295	268	12-Ф23	249	3	22
250	600	405	355	319	12-Ф28	305	3	22
300	700	460	410	370	12-Ф28	412	4	24.5
350	800	520	470	415	16-Ф28	445	4	26.5
400	900	580	525	465	16-Ф31	505	4	28
450	1000	640	585	520	20-Ф31	695	4	30
500	1100	715	650	570	20-Ф34	750	4	31.5
600	1300	840	770	670	20-Ф37	850	4	36

Nota:1. Otras especificaciones y normas de brida disponibles bajo pedido.

2. El diseño y las especificaciones están sujetos a cambios sin previo aviso.