Valves Flashcards by Hey Now

Primary function of valves is too

Control flow

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What valve provides minimal pressure loss or turbulence

Gate valve

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What valve is not recommended to throttle

Gate Valve

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What design of gate valve is most common

Solid wedge

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What gate valve design is less prone to chatter

Solid wedge

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What gate valve design may stick with varying temp and is not well suited to compensate for distortions

Solid wedge

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What gate valve design has two separate wedge halves

Split wedge

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What gate valve design has 2 discs mounted on either side of spreading device

Double disc

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What gate valve design is the most expensive but can take the most seat misalignment

Double disc

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Globe valves are _____

Directional

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Preferred valve when throttling flow

Globe Valve

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A local water flow alarm is required on sprinkler systems with more then

20 sprinklers

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The fire department connection size can be

Minimum of 2 1/2 but must be at least the size of the largest riser being served

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FDC’s are required to be how far above ground

18-48”

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Larger systems, water must be delivered in how much time to ITV

60 seconds

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PIV must be installed so the top of the post is _______ above grade

32” to 40”

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What globe design has max resistance to corrosion

Plug disc

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Short tapered disc, metal on metal contact

Conventional disc

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Flat soft disc against the seat in the valve body

Composition disc

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Sharp point that controls flow through seat, excellent for throttling

Needle valve

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What globe design is most common in sprinklers

composition disc

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Best suited where a 90 bend is required

Angle valve

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Thread design easiest to tell if open or closed

Rising stem with outside screw

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Common stem design for angle and globe valves

Rising stem with inside screw

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Stem design typically found in gate valves, doesn’t move up or down

Non rising stem with inside screw

Bonnet joint not good for frequent service/light duty

Screwed bonnet

Best bonnet for service, more strength then screwed

Union bonnet

Bonnet that consists of flanged connection with nuts bolts and gaskets

Bolted Bonnet

This bonnet has a “U” that wraps around the body holding it in position

Clamp bonnet

Nuts hold gland and packing in place

Packing nut with gland

Gland and packing held in place with bolts

Bolted gland

Gland and packing held in place with swing type bolts for easy service

Lantern type gland

Which valve allows full flow or no flow in both directions with minimal pressure drop

Butterfly valve

Pressure reducing valve max set pressure on sprinkler system

165psi

Pressure relief valve pressure set

175, or 10 psi above system pressure

Electrically supervised valves need to be inspected

Quarterly

Valves are to be tested

Annually through its full range

Maintenance on os&y valves is done by

Lubricating valve, open and close to distribute lube,

Supervisory switches are tested

Semi-annually

Signal must be received from supervisory within

2 revolutions of operating wheel, or when stem was turned 1/5 from normal position

External leaking points on os & y

Packing, bonnet, flanges

Gauges must be installed on

Inlet and outlet

Pressure reducing valves inspected to verify open position, not leaking, maintaining downstream pressure, hand wheels are un broken

Quarterly

Master pressure reducing valves supply & discharge should be inspected

Weekly

A full flow test is conducted every ____ years, a partial flow test is conducted _____

5 years, annually

Main drain test must be done

Annually, or whenever valve is closed

Five principle valves in sprinklers

Gate, globe, butterfly, ball, check

Three different stem designs are

Rising stem with outside screw Rising stem with inside screw Non-rising stem with inside screw

3 different stuffing boxes are

Packing but with gland Bolted Lantern

4 types of bonnet designs are

Screwed Union Bolted Clamp

3 disc designs for gate valves

Solid, Split, Double disc

4 types of disc design for globe valves

Plug disc Conventional disc Composition disc Needle valve

Up to 2” riser or main size, what is the required drain size

3/4” or larger

2 1/2 to 3 1/2 riser or main size, what is the required drain size

1 1/4 or larger

4” or larger riser or main size, what size drain is required

2” or larger

Where a section of piping is more than ____ gallons a 1” valve piped to an accessible location is required

S.S

Stainless steel

F.M

Factory mutual approved

U.A

Underwriters approved

I.B.B.M

Iron Body Bronze Mounted

S.W.

Solid wedge

D.D

Double disc

R.S

Rising spindle

N.R.S

Non rising spindle

W.S.P

Working stem pressure

W.O.G.

Non-Shock cold water oil gas

O.S & Y

Outside stem and yoke

P.I.V

Post indicator valve

E.P.D.M

Ethylene Propylene dien monomer

U.L.C

Underwriters laboratories Canada

c.U.L

Canadian underwriters laboratories

Valves Flashcards

(71 cards)