When ordering we have to make it clear to vendor regarding downstream sealing only or upstream + downstream sealing. They are generally slower in actuation than quarter-turn valves and are most commonly used in applications where valve operation is infrequent such as isolating valves. Rising stem/outside screw and yoke construction is recommended where high temperatures, corrosives, and solids in the line might damage stem threads inside the valve. One reason for that is, the expanding action can tend to trap hard particles between gate and seat. With a OS&Y valve, as the stem turns, it moves into or out of the valve, which also moves the gate to open or seal the valve. Design Standard: AWWA C509/C515. Select Size: Search Results View all results. Sealing is by differential pressure. OS&Y means "outside screw and yoke" The designation has to do with the location of the screw nut and the shaft screw threads. Classification of Gate Valves: According to bonnet construction: Bonnets for gate valve come in different designs to satisfy various requirements. But it goes much farther than that, in that an OS&Y valve provides unique protection that a typical gate valve or ball type valve cannot provide. The handle should then move freely. The NYC plumbing code and OS&Y valves.
What is an OS&Y valve? Dimensions, drilling and facing of flanges conform to American Cast Iron Flange Standard, Class 250 (ASME B16. Button link="/contact-balkan-plumbing/" bg_color="#EA6E24″ window="yes" size="xl"]Get a FREE no-obligation site visit today! When the handle is turned counter clockwise, the gate will open allowing the water to flow through freely.
You can look at an OS&Y gate valve. Collection: F-607-RWS. Material: Ductile Iron, Rubber. Outside screw and yoke (OS&Y) gate valves are recommended when positive shutoff and a quick visual indicator of open/closed position is required.
Bodies of 6″ and larger have bosses for by-pass and drain connections. In this style, the screw nut is supported by an A-frame type "yoke" outside of the enclosed body of the valve. Lunkenheimer Gate Valves are designed for dependable performance on high pressure steam, water, gas and oil lines. AWWA C500 Gate Valve is the most robust gate valves on the market. Part #NF607RWSLF10 | Item #7052142 | Manufacturer Part #NS2920M.
Lunkenheimer Gate Valve: Fig 1436 IBBM. Knife Gate Valves: * Should not be used in hazardous service or high pressure service. Stem: Stainless Steel 304. Frequently if a leak appears on an OS&Y valve it is because the packing is too loose. Gate valves provide straight through unobstructed passage way, which results in minimum pressure loss. Both types are used extensively in all kinds of municipal and industrial water service. Material Type: EPDM. With an OS&Y valve it is always clear whether the valve is open or closed.
The knife edge pushes aside and cuts through solids in the flow. 250Nb R/G Gate Valve OS&Y. The stem being visible, clearly being either raised or lowered, takes much of the guesswork out of operating the valve. Parallel Slide Gate Valves: * These are made with 2 body pieces assembled with a spring in it. However under very low pressure i. e 5 psi light seepage would not be considered abnormal with this kind of valve. In the open position, the backseat helps protect the stem threads; but, care must be taken to protect the stem externally. The only exception to these rules would be if the contractor is making a repair to a existing 2. Simply tightening the packing nuts of screws will stop the leak. Valve Type: Resilient Wedge Gate Valve. The Shitbox Rally Wrap-Up – Ben and Rob finished! 96 lbs Quantity per Case 6. Our office will resume its operations in. In other words flushing a toilet or turning on a sink will not let you know if the fire sprinkler system is active.
All main control valves for fire protection must be ' O uter S tem & Y oke' type valves. The basic design is suitable for use in a wide range of application eg well head isolation, process piping, tank etc. This avoids someone accidentally closing the valve and deactivating the fire sprinkler system for the property. Cast iron with bronze facing rings in 8″ and larger sizes; all others solid bronze. Guide channels in disc are accurately machined and guide ribs in body are precisely cast, reducing wear. NSF Specifications: NSF 372, NSF 61. The area where the body is in contact with the joint is covered by stainless steel, improving surface's quality and avoiding corrosion issues. When the hand wheel is turned, the stem rises as the yoke bushing engages the stem threads. Heat, corrosion, erosion, and solids may damage the stem threads inside the valve and cause excessive wear. Wedge Gate Valve: * The wedge shaped disc is utilised to introduce a high supplementary seating load that enables metal-seated wedge gate valves to seal not only against high, but also low, fluid pressures.
Wedge shaped solid and flexible gates are available. The gate design is always of the through conduit type. Epoxy Coated interior and exterior surfaces. Parallel Expanding Gate Valves: * These valves have inclined internal surface and parallel seats. STI - Safety Technology International. Valves like wedge type when closed in heat lines during hot temperature may be very difficult to open in cold temperature due to expansion. When are OS&Y Valves Required?
As it is a globe valve the movement is a very short distance compared to a gate valve. Installation Manual. Two supporting webs between pipe flanges and body flange help strengthen valve against pipe line strain. In addition to visual inspection, NYC code also requires that all handles and visual standpipe (sprinkler line) must be color coded. The NIBCO® flanged, ductile iron, gate valve is designed to be the main control valve in an automatic fire sprinkler system. Wedge: EPDM Coated Ductile Iron. Certificate of Compliance. Why is an OS&Y valve so important? Bonnet is that the body-bonnet joints seals improve as the internal pressure in.
The closing is only made over one of the seats. A fire hydrant is a specialy OS&Y, globe valve where the shaft is totally encased and the nut is turned with a special wrench. Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. Recommended Valve Application: Commercial, Fire Protection, Industrial, Mechanical. Fire Protection Resilient Seat OS&Y Gate Valve Flange End. The variants can be seen in below image.
Bodies 6″ and larger may be used with by-passes and drains. Shipped with flanges drilled unless otherwise specified. In addition, because they are UL rated, they seem to be better constructed than many other typical water valves.
Product Specifications. EPDM disc and O-rings. Our office is currently closed for the weekend. Must be the same size as the water service line.