10–600# Full-bore, soft‑and‑hard double‑seal swing check valve for long-distance pipelines-Zhejiang FLOWTECH. Machinery Co., LTD.

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Valve

10–600# Full-bore, soft‑and‑hard double‑seal swing check valve for long-distance pipelines

Classification:

Swing soft seal check valve

keywords： 10–600# Full-bore, soft‑and‑hard double‑seal swing check valve for long-distance pipelines

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daviszheng@vezflowtech.com

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The swing-type soft-seal check valve features a pivoting‑plate design: the disc opens under the thrust of the fluid flow and closes by gravity and back pressure when the flow reverses. The disc is fitted with a rubber or PTFE soft seal that forms a tight, leak‑free interface with the valve seat, ensuring excellent sealing performance. Its straight‑through flow path provides smooth flow, low fluid resistance, and gentle opening and closing action, minimizing water hammer. The valve body is available in cast steel, cast iron, stainless steel, and other materials; installation is not restricted by flow direction, making it suitable for water supply and drainage, gas, chemical, HVAC, and other piping systems to prevent backflow. It can be installed horizontally or vertically in multiple operating conditions.

Standard Design of Soft Sealing Swing Check Valves

Design Features

1. Body: integral or removable seat designs available. Metal or soft sealing are both available.
2. A variety of Body and Trim Materials from Trim 1 to Trim 18 acc. to API 600.
3. Without expensive actuation or reliance upon an outside power source, a Flowtech swing check valve prevents backflow in a fraction of a second. The clapper is the only moving part which swings to allow flow. at the moment flow ceases, the clapper returns to the closed position, creating an instant barrier to reverse flow. it is simple and effective.
4. A swing check valve is easy to troubleshoot and easy to maintain with convenient top entry access to all valve internals.
5. In its standard configuration these valves have a bolted cover and a free swinging clapper. The clapper is the closing member that responds to the prevailing flow conditions.
6. All valves are full bore, full conduit design and will allow the passage of various pipeline inspection gauges and spheres. The full bore design ensures a low pressure drop across the valve and less turbulence than with reduced bore valves or alternative designs of swing check valves."
7. The valve ends are available to meet any pipeline requirement. The valves are supplied with raised face, ring type joint flanges or weld ends. Raised face and ring type joint flanges comply with the requirements of aSMe B16.5 and ASME B16.47 as appropriate.
8. Flanges are back faced to provide a smooth bolting surface to allow even bolt loading during installation in the pipeline.
9. Weld end valves comply with ASME B16 .25 unless otherwise agreed with the customer. Hub ends and other specialty end connections are available upon request.

	Flowtech swing check valves are available with either an integral seat or a renewable seat. A renewable seat extends the life of the valve by allowing all internal parts and seals to be replaced with the valve body still installed in the pipeline. Sealing materials are selected for the valve service conditions. Pressure, temperature and flow media are all considered when selecting seals. Standard seal materials include Fluoro elastomer and nitrile for the seat to clapper seal. Standard cover seal materials are nitrile and Fluoro elastomer but, ring joint gaskets can also be used for the cover to body seal. Flowtech valves are available with an extended operating shaft to allow the valve to be locked in the open position for pigging or testing purposes, or to mount a rotary damper for pulsating gas flow service.
	Flowtech swing check valve features a seat that is integral with the standard body. As an option, a renewable seat is field serviceable and facilitates the use of corrosion resistant steels, overlays, and seat styles. Renewable seats are securely mounted inside the valve body using fasteners. The renewable seat option allows the repair or replacement of all the seat sealing elements in the valve. By having both the seat and clapper as separate parts from the body, a damaged valve can be restored to as-new condition and performance. A renewable seat also facilitates use of different corrosion resistant materials and modified seat designs to accommodate pipeline pigs.
	The clapper is a one piece cast design that is mounted to the valve clapper-arm with a secure and positively located fastener. The sealing surface may be overlaid with SS316 where an O-ring groove can be cut out for soft sealing.
	Another aid in successful pigging operations, especially in the reverse direction, is the 45 degree seat. The seat ring and clapper seat faces are profiled at a 45 degree angle to assist as pipeline pigs transition through the valve body. Changes in profile at the seat area that could potentially catch the edge of a pig and damage instruments are minimized.
	Gland and Seals The standard gland is a bolted-on shaft cover with an elastomer seal. The gland bolting pattern is standardized for all gland types to allow multiple gland and shaft seal configurations without machining the body. Polymer seals are optional.
	Bearings for Shaft Stainless steel bearings backed with sulf-lubricated alloy steel sleeves are located on both ends of the valve shaft to support the arm and clapper for smooth, low friction movement of the clapper Cover Seals an elastomer seal is the standard seal. Metal seals are optional and available in various materials options. The cover and bolting pattern are standard regardless of type of cover seal Body Bolting as a standard, all bolting meets ASME B16.34 and ASME Viii Div. 1 design requirements.
	Gland Designs The G1 gland is the standard gland for extended shaft configurations. it features a bolted on gland body with two elastomer shaft seals and an elastomer body seal. lubricant / sealant injection is standard between the primary and secondary shaft seals. Polymer seals are available as an option
	The G2 gland is an optional gland for extended shaft applications. it features two spring energized lipseals for shaft seals and an elastomer body seal. lubricant/sealant injection is also a standard feature on this gland. For 6” through 16” valves, the secondary lipseal is retained by a threaded gland retainer. For valves 20” and larger, the secondary lipseal is retained by the gland flange. in both cases, the secondary lipseal is field replaceable
	The F1 gland is used for subsea service, and features spring energized polymer lipseals for the dynamic shaft seals and double barrier elastomer seals for the gland body seals. The gland contains an outward facing lipseal that prevents ingress of seawater into the valve. The gland flange seals against the gland body and the gear operator to prevent seawater ingress. in the event of shaft seal leakage, the gear operator is protected from internal pressure by means of a pressure relief fitting installed in the gland flange
	an optional shaft cover is available that can bolt directly to the extended shaft gland, or flange to protect the shaft when it is not in use. The shaft cover is designed to contain the valve’s full rated working pressure and to prevent leaks to the environment
	Lock Open Devics The lock open device allows easy opening of the check valve clapper and locks the clapper in the full open position. The lock open device is intended for applications requiring the override of the normal check valve function. These applications may include locking open for testing, line drainage, reverse pigging or other reverse flow conditions. Valves 16” class 900 and smaller can be locked open using a manual lever or a gear operator. larger valves are supplied with a gear operator to lock open the valve as a standard. in either configuration, the lock open device will hold the valve in the open position for operating scenarios. The lock open feature requires that the valve have an extended shaft. The shaft seal gland can be either an S1 gland with elastomer seals or an S2 gland with lip seals. Use of the lock open device requires equalized pressure (balanced pressure) across the closed clapper. excess force applied to open the valve against differential pressure may damage the internal components of the valve . a valve shaft cover is furnished with the valve for installation when the lock open device is not in use.