Valves like wedge type when closed in heat lines during hot temperature may be very difficult to open in cold temperature due to expansion. Connection: Flange End. How does a fire sprinkler head operate? OS&Y means "outside screw and yoke" The designation has to do with the location of the screw nut and the shaft screw threads. ASME Specifications: ASME B16.
Outside stem and yoke rising stem gate valve by Arita Fire Solutions, with full encapsulated EPDM coated wedge design to ensure drop-tight sealing and reduction of wear and jamming. Afterwards remember to tighten pack the packing. Other states will follow in the coming... 80Nb R/G Gate Valve OS&Y. The NIBCO® flanged, ductile iron, gate valve is designed to be the main control valve in an automatic fire sprinkler system. Certification: UL/FM. Because gate valves open slowly they also prevent water hammer effect. When installing a new water main for fire protection it is vitally important to use the correct main control valve inside the building. Thrust faces of the nut and the yoke hold the nut in a fixed position as the shaft (or "stem") rises of lowers without turning. EPDM disc and O-rings. What is O S & Y Gate valve and how is it different from a normal Gate valve? Wedge shaped solid and flexible gates are available. The handle and the stem are both threaded so they interact together. With other water gate valves, visual inspections will not determine if the valve is opened or closed. In this case the contractor would hook-up to the existing 2" tap on the city main.
What is a Gate Valve? Complete Assemblies. Leaks most commonly arise at the contact surface between the gasket and the body. Heavier in comparison with wedge or slab type.
Bodies of 6″ and larger have bosses for by-pass and drain connections. Lunkenheimer Gate Valves. Both types are used extensively in all kinds of municipal and industrial water service. Heat, corrosion, erosion, and solids may damage the stem threads inside the valve and cause excessive wear. This design of gate valve is commonly used for clean fluids and steam applications. This is vitally important for properly maintaining fire protection. Certificate of Compliance. What is an OS&Y valve? With an OS&Y valve it is always clear whether the valve is open or closed. Wedge gate valve does not shut off against high pressure gas as efficiently as slab or expanding gate valve so in those cases the later is specified. All valves must be UL Listed (UL stands for Underwriter Laboratories, which is a global independent science company). It is more difficult with an OS&Y globe valve because the shaft movement is short. Flexible wedges have a grove cut in it, which makes it sit on the seat surface more easily.
And tell if it is open or closed by the position of the shaft. 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. There is a packing gland around the where the shaft enters the valve body. Residental or Contractor *. Bronze mounted (IBBM) to handle fluids for above service. Pressure Class: 300#. Knife Gate Valves: * Should not be used in hazardous service or high pressure service.
Suggested Specifications. Stem: Stainless Steel 304. Expanding gate valves should not be use in steam service. OS&Y means Outside Stem and Yoke. VESDA Aspirated Smoke Detection for Jet (Impulse) Fans in Carparks - FlameStop TV Episode 42. In addition, because they are UL rated, they seem to be better constructed than many other typical water valves. OS&Y valves visibly show whether the valve is opened or closed which differs from a domestic water service where you can simply turn on the shower or sink to test its functionality. In those situation these valve are used instead. HomeSeer Technologies. What Code and Standard are followed for gate valve? The gate design is always of the through conduit type. Expanding gate valves are not recommended for sandy / abrasive service.
22 in Ship Weight 9. Cast iron with bronze facing rings in 8″ and larger sizes; all others solid bronze. ANSI Specifications: ANSI 372, ANSI 61, ANSI B16. Valve Type: Resilient Wedge Gate Valve. The closing is only made over one of the seats. When the hand wheel is turned, the stem rises as the yoke bushing engages the stem threads.
The two gate halves are forced out against the seats at point of closure providing a tight sealing without the assistant of fluid pressure. That means that when the handle is turned it directly raises and lowers the gate of the valve by interacting directly with the stem of the valve. If the valve handle on an OS&Y valve will not move, the packing may be too tight. Gate valves provide straight through unobstructed passage way, which results in minimum pressure loss. All water main valve handles must be the following: Dedicated standpipe valve handles must be painted red. Handwheel – open left or open right.
Rising Stem/Inside Screw: Here the hand wheel and stem both rise, adequate clearance must be provided for operation. J&S Metal Seated Gate Valves design and materials exceed AWWA C500 for long life. The more you know the safer you, your family, and your property may be. Wedge: EPDM Coated Ductile Iron.
Advanced Control Technologies (ACT). Installation Manual. ISO Specifications: ISO 9001. FLAMESTOP INFORMATION. When the handle is turned clockwise the gate will close preventing any water from traveling through the valve.
Our office is currently closed. Body/Bonnet Coating: Epoxy Resin Fusion Bonded. This can be easily accomplished using any common wrench, and does not require a skilled plumber. In both types the valve packing also acts as a guide. Epoxy coated body inside and out per AWWA C-550 (coating NSF and FDA certified). Frequently if a leak appears on an OS&Y valve it is because the packing is too loose. Product Specifications. The only exception to these rules would be if the contractor is making a repair to a existing 2. NRS means Non-Rising Stem. One quick look at an OS&Y valve with the stem raised out of the body of the valve and you will know that the water is on.
The knife edge pushes aside and cuts through solids in the flow. The basic operation of this kind of valve, where the seal is achieved from the pressure exerted by the fluid flowing through the valve, is as follows: Internal pressure forces the bonnet upwards against the gasket, creating forces in the contact areas between the gasket and the bonnet and between the gasket and the body. The RTI can also be specified in imperial units, where 1 ft is equivalent to 0. Current time is EST.
API 602 (FOR SIZE 1/2" to 1-1/2"). 09 in Quantity per Carton 2 C - Height Closed 11. 5" or 3" sprinkler main that was previously hooked up to a 2" tap connection. The bulb breaks as a result of the thermal expansion of the liquid inside the bulb. STI - Safety Technology International.
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