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» Valve & Pump » AWWA C509 Resilient Seated Gate Valves

AWWA C509 Resilient Seated Gate Valves

October 16, 2020

Technical Drawing

Drawing of AWWC C509 OS&Y ring-stem gate valve

G.A drawing and product photo for the AWWA C509 OS&Y rising-stem resilient-seated cast iron gate valve.

AWWA C509 non-rising stem gate valve

G.A drawing and product image for the AWWA C509 non-rising stem resilient-seated cast iron gate valve.

Design Characteristics & Material Selection

Released by American Water Works Association, AWWA C509 is the standard for resilient-seated gate valves for water supply service. The terminology “resilient-seated” is sometimes also expressed as “resilient wedge”. It indicates that the wedge of the gate valve, which has plain one-piece hollow construction, shall be encapsulated/ coated with a layer of rubbers of plastics. In other words, resilient seats shall be bonded or mechanically attached to the gate wedge. When the gate valve is turned off, the rubber or plastic encapsulated wedge travels down to the bottom of flow passage of the valve body. An effective seal is achieved between the seating surfaces of the wedge and the body. Compared to metal seated gate valves, it doesn’t require a bottom debris-trapping “pocket” on the body, thus, the water can flow through without any obstruction when the valve is fully open. The body and bonnet of AWWA C509 resilient seated gate valves shall be made of gray iron or ductile iron. In engineering practice, ductile iron is preferred due to its superior strength and toughness.

Valve PartMaterial
BodyASTM A536 Gr. 65-45-12
BonnetASTM A536 Gr. 65-45-12
WedgeASTM A536 Gr. 65-45-12/
ASTM D2000 EPDM
StemStainless Steel 304
AISI 420
ASTM B16 C36000
Wrench NutASTM A536 Gr. 65-45-12
HandwheelASTM A536 Gr. 65-45-12
PackingASTM D2000 EPDM
O-RingsASTM D2000 EPDM
GasketsASTM D2000 EPDM
*The non-rising stem gate valve shall be furnished with wrench nut; The OS&Y rising-stem gate valve shall be furnished with handwheel.
*Working pressure: 200 psi; working temperature: -4°F to 230°F.
*Flange dimensions to ASME B16.1 Class 125; shell test pressure: 300 psi; seal test pressure: 220 psi.

Dimensions

NPSLH
2"7.010.8
2-1/2"7.511.7
3"8.012.7
4"9.014.1
5"10.016.3
6"10.517.6
8"11.521.0
10"13.024.3
12"14.027.8
*AWWA C509 non-rising stem gate valves Shijiazhuang Metalsin supplies, resilient seated, 2″~12″, RF flanges, with wrench nut; all dimensions are in inch.

SizeLHD
2"178362180
2-1/2"190402180
3"203483200
4"229534200
5"254661250
6"267727250
8"292830320
10"3301112370
12"3561291370
*AWWA C509 OS&Y rising stem gate valves Shijiazhuang Metalsin supplies, resilient seated, 2″~12″, RF flanges, handwheel operated; all dimensions are in mm.

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