» Valves & Pumps » AWWA C500 OS&Y Metal Seated Gate Valves

AWWA C500 OS&Y Metal Seated Gate Valves

June 4, 2024

Main Design Features

SJZ Metalsin supplies AWWA C500 OS&Y rising stem metal seated gate valves for water supply service. These valves have the same metal-to-metal seals as that of the NRS metal seated gate valves, which are formed between a pair of accurately machined copper alloy seat rings seated/mounted in the body and wedge respectively. The closure member of the gate valve is usually a solid hollow gate in wedged shape, using two inclined seats  and a slightly mismatched inclined gate to secure tight shutoff, even against higher pressures. The body and bonnet are made of ductile cast iron (ASTM A536 Gr.65-45-12)or grey cast iron (ASTM A126 Gr.B). Both the interior and exterior surfaces of the valve are fusion bonded epoxy (FBE) coated in accordance with AWWA C550. The AWWA C500 OS&Y rising stem metal seated gate valves are available in sizes 2″ through 48″, meeting the design working water pressure 250 psi. They are usually furnished with flanged ends, which are made in accordance with ASME B16.1 Class 125, or other standards upon purchaser’s request.

AWWA C500 OS&Y gate valves.

The AWWA C500 metal seated gate valves with OS&Y rising stem design (the yoke is bolted onto the bonnet), 16″ 250 psi in assembly workshop, delivered to Manzanillo, Mexico.

The most notable design feature of these valves is the OS&Y rising stem. In the rising stem design, the wedge is fixed to the valve stem. As the handwheel is turned, the threads (which are located above the packing box) retract the wedge from the flow stream, causing the threaded portion of the stem to rise above the handwheel. “OS&Y” stands for “outside screw and yoke”. In an OS&Y gate valve, the threaded stem is located outside the valve body. When the valve is operated, the stem moves up and down outside the valve body, making it easy to see the position of the valve (open or closed) based on the stem’s position. The yoke is a structure mounted/bolted on the valve body that supports the stem. It provides a guide for the stem to move vertically and ensures proper alignment during operation. The OS&Y rising stem design allows easy visual indication of the valve’s open or closed position. It reduces wear and tear on the stem threads while simplifies maintenance.

Material Selection for Main Parts

Drawing of AWWA C500 OS&Y gate valve, handwheel

Figure-1: The typical photo & G.A. drawing of AWWA C500 OS&Y rising stem metal seated gate valve, handwheel operated, applicable to 2″~12″.

Part NameMaterial Specification
BodyASTM A536 65-45-12
ASTM A126 Gr.B
BonnetASTM A536 65-45-12
ASTM A126 Gr.B
YokeASTM A536 65-45-12
ASTM A126 Gr.B
Body Seat RingASTM B62 C83600
ASTM B16 C36000
WedgeASTM A536 65-45-12
ASTM A126 Gr.B
Wedge Seat RingASTM B62 C83600
ASTM B16 C36000
GlandASTM A536 65-45-12
ASTM A126 Gr.B
StemSS420, SS431
SS304, SS316
Stem NutASTM B148 C95200
GasketEPDM/NBR
PackingGraphite
O-RingEPDM/NBR
FastenersCS+Zinc Coated
SS304, SS316
HandwheelASTM A536 65-45-12
ASTM A126 Gr.B
*Material specifications for main valve parts.

Basic Dimensions

Drawings of bare stem & bevel gear operated AWWA C500 OS&Y flanges.

Figure-2: G.A. drawings for AWWA C500 OS&Y rising stem gate valves with bare stem or bevel gear operator, respectively. Applicable to sizes 14″ and above.

SizeL
mm
H
mm
2"178405
2.5"191415
3"203486
4"229632
5"254710
6"267842
8"2921100
10"3301228
12"3561372
14"3811595
16"4061910
18"4322180
20"4572202
24"5082745
28"6102920
30"6103350
32"6603530
36"7113950
42"9154415
48"11805265
*Basic dimensions for AWWA C500 OS&Y rising stem metal seated gate valves: L – face-to-face dimensions; H: maximum open height.

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