Attribute Schema Library
Attribute schemaplumbing & PVF

Gate Valve Attributes for Plumbing & PVF Distributors

A gate valve is on/off only — a wedge drops into two seats to close the bore. Buyers aren't comparing flow curves; they're matching a valve to a line: size, end connection, body alloy, pressure class, and whether the stem can rise where it's going. The buyers are mechanical and fire-protection contractors, water utilities, plant maintenance, and MRO desks replacing a valve already in the wall.

The data is hard for two structural reasons. Gate valves carry two or three simultaneous pressure ratings — a Class 125 iron valve is 200 psi CWP and 125 psi WSP to 353°F — and supplier feeds put one of those numbers in one "pressure" field with no basis. And the category spans four unrelated standards families: MSS SP-80 for bronze, MSS SP-70 for gray iron, API 600/602/603 for steel, AWWA C509/C515 for waterworks. One gate valve tree holds all four, each with its own words for the same concept.

Then there's the January 2014 lead-free cutover, which split every bronze line into potable and non-potable variants that look identical on the shelf and differ by a suffix.

Core

Every SKU needs these. Without them the record is not a product, it is a row.

Valve Size (Nominal)
number · in (DN)
2 in (DN 50)

The first filter on every rail. Must carry both the imperial call size and the DN equivalent; PVF lines and waterworks lines label the same bore differently.

End Connection
enum
Flanged, Class 150 Raised Face

Decides whether the valve can be installed at all. Threaded, solder, press, grooved, flanged and MJ are not interchangeable and each has its own class.

Body Material
enum
Bronze, ASTM B62 (C83600)

Drives compatibility, pressure class and price. Cast alloy designations (CF8M) and wrought grades (316) are not the same spec and cannot be merged.

Pressure Class
enum
Class 125

Sets the flange drilling and the pressure-temperature curve per ASME B16.34 or B16.1. A Class 125 iron flange will not mate a Class 300 pattern.

Cold Working Pressure (CWP)
number · psi
200 psi non-shock

The non-shock rating at ambient. This is the number most water and general-service buyers filter on, and the one most often confused with the class.

Stem Type
enum
Non-Rising Stem (NRS)

Rising stem shows position and needs headroom; non-rising stem fits pits and tight walls. Wrong choice means the valve physically cannot be opened.

Wedge Type
enum
Solid Wedge

Solid wedge takes pipe stress and steam; flexible wedge tolerates thermal distortion; resilient wedge seals bubble-tight on water but is not for steam.

Manufacturer Part Number (MPN)
identifier
NIBCO T-113

The only key contractors and counter staff actually quote. Figure numbers like T-113 and S-113 differ only by end connection.

GTIN / UPC
identifier
00046224113005

Required by Amazon Business and every GDSN data pool. Each size, end connection and lead-free variant is a distinct GTIN, not one per figure number.

Differentiating

What buyers actually compare on. This is where catalogs win or lose the filter.

Bonnet Type
enum
Screw-In Bonnet

Determines whether the valve can be repacked in line. Screw-in bonnets are throwaway; union and bolted bonnets are rebuildable — a real MRO filter.

Saturated Steam Rating (WSP)
number · psi
125 psi to 353°F

The separate steam rating, always lower than CWP and always paired with a temperature. Steam-service buyers filter on this and nothing else.

Maximum Operating Temperature
number · °F (°C)
450°F (232°C)

Caps the service. EPDM-seated waterworks valves stop near 180°F; bronze runs to 353°F saturated; CF8M bodies go to 450°F and above.

Trim / Seat Material
enum
EPDM-Encapsulated Ductile Iron Wedge

Decides shutoff quality and media compatibility. Bronze trim, 13% Cr, Monel and EPDM-encapsulated wedges are different products at the same size.

Operator Type
enum
2 in Square Operating Nut

Handwheel, bevel gear, square nut, chainwheel or actuator. Large flanged valves are unusable without gearing; buried valves need the operating nut.

Compliance & identifiers

Standards, regulatory data, and the identifiers channels reject you for missing.

Design Standard
enum
MSS SP-80

Which family the valve is built to. Specs are written as 'MSS SP-80 Class 125' or 'API 600'; a valve without the reference cannot be submitted.

Lead-Free Compliance (NSF/ANSI 372)
boolean
Yes — NSF/ANSI 372 certified

SDWA Section 1417 caps wetted lead at 0.25% weighted average for potable water. Non-LF bronze gate valves are still sold legally for other service.

UL Listed / FM Approved
boolean
UL Listed; FM Approved

Fire protection AHJs accept only listed valves. Sprinkler contractors filter this first and will not read a description to find it.

Country of Origin
enum
United States

Drives Section 301 tariff class and American Iron and Steel eligibility on federally funded municipal water projects.

The fields that aren't in the schema at all

What most gate valves catalogs are missing.

The table above is the schema most catalogs already have. These are the attributes that usually aren't in it — each one surfaced by a signal from the live market rather than by an audit of what's already there. This is what Anglera's Schema Foundry does on a real catalog, in this category.

Competitor signal
+ Lead-Free Compliance (NSF/ANSI 372)

Supply-house rails expose a 'Lead Free' facet. Many catalogs list non-LF bronze gate valves — barred from US potable water since Jan 2014 — in the same result set as their LF twins, no field between.

Contractor gets a non-LF valve for a potable riser, the inspector fails the install, and it comes back opened. Lost credibility on a spec job, not just a return.

Supplier signal
+ Pressure Rating Basis (CWP / WSP / WOG)

Supplier feeds send 'Pressure: 125 PSI' and 'Pressure: 200 PSI' for the same Class 125 iron gate valve. One is saturated steam, one is cold working. The catalog has one pressure field, no basis field.

A steam buyer filters 200 psi, gets a valve rated 125 psi WSP at 353°F, and puts it on a steam header. The failure mode is not a return.

Search signal
+ UL Listed / FM Approved

Fire protection contractors search 'UL FM OS&Y gate valve' as a phrase. Catalogs that carry the listing only inside description text return nothing for that query and nothing on the facet rail.

Fire sprinkler RFQs route to whoever can filter it. The valve is in stock and listed — it just cannot be found, or proven on the submittal.

Supplier signal
+ Face-to-Face / End-to-End Dimension

Every manufacturer dimension drawing carries the ASME B16.10 laying length; almost no catalog row does. Buyers replacing a valve in an existing spool ask the counter for it by phone.

Replacement valve arrives shorter or longer than the gap. Job stops, valve returns, and the pipe gets re-cut on the distributor's dime.

Review signal
+ Open Height / Stem Rise Clearance

OS&Y datasheets list a separate open dimension; catalogs publish only the closed height, if anything. Buyers ask 'how much room does the stem need' before ordering.

Rising-stem valve fits the pipe but not the pit or the ceiling pocket. Discovered at install, after the flanges are bolted.

How Schema Foundry finds these

Messy in, governed out.

The same value, spelled every way plumbing & PVF suppliers spell it. A filter only works once they agree.

End Connection
FIPTF.N.P.T.NPT FemaleThreaded (NPT)IPS ThreadFemale Thrd
Threaded, NPT Female (FNPT)

Grainger labels it FIPT/MIPT, Ferguson labels it Threaded, the datasheet says NPT. Same connection, three rails, no merge.

Stem Type
NRSN.R.S.Non Rising StemInside ScrewIS/NRSNonrising
Non-Rising Stem (NRS)

'Inside screw' describes the mechanism, NRS describes the behavior. Suppliers use them as synonyms; buyers filter on only one.

Body Material
CF8MSS316316 StainlessA351 CF8MCast 316 SSStainless
Stainless Steel, ASTM A351 CF8M

CF8M is the cast analogue of 316, not 316 itself. Flattening both to 'Stainless Steel' loses the spec a submittal is written against.

Valve Size (Nominal)
2"2 in2.0DN5050mm2 IN.
2 in (DN 50)

Waterworks feeds arrive in DN, PVF feeds in inches, and 50 mm is not the actual bore. Sorting breaks when size is stored as text.

What buyers ask

Every one of these should be answerable from the attributes above. If it isn't, that's a gap.

  • Is this the lead-free body or the old one? It's going on a potable riser.
  • Is that 200 psi cold working, or is it the steam rating?
  • Rising or non-rising stem? This one goes in a buried valve box.
  • How much headroom does the stem need when it's all the way open?
  • Is it UL Listed and FM Approved? I need it on the sprinkler riser submittal.
  • What's the face-to-face? I'm dropping it into an existing spool.
  • Solid wedge or resilient? There's steam in this line.
  • Will a Class 125 iron flange bolt up to my Class 150 flange?

What channels require

The same SKU, different mandatory fields per destination.

Distributor faceted catalog (own site)
Valve Size (Nominal)End ConnectionBody MaterialPressure ClassStem TypeLead-Free Compliance
Amazon Business
GTIN / UPCManufacturer Part Number (MPN)Country of OriginValve Size (Nominal)Body MaterialEnd Connection
GDSN data pool (1WorldSync / Syndigo)
GTIN / UPCBrandNet ContentCountry of OriginGPC Brick Code
Contractor submittal package
Design StandardPressure ClassCold Working Pressure (CWP)Trim / Seat MaterialFace-to-Face DimensionUL Listed / FM Approved

Gate Valves data, in practice

What's the difference between CWP, WSP and WOG on a gate valve?

CWP is cold working pressure — the non-shock rating at ambient. WSP is working steam pressure, saturated, always paired with a temperature and always lower. WOG (water, oil, gas) is effectively CWP for non-steam media. A Class 125 gray iron gate valve to MSS SP-70 is 200 psi CWP and 125 psi WSP to 353°F. Those are the same valve, and both numbers are correct. The failure is a catalog with one 'Pressure' field: whichever number the supplier picked becomes the truth, and the other disappears. Model them as separate attributes with the temperature attached to WSP. A steam buyer and a chilled-water buyer are filtering on different numbers.

Which design standard applies to my gate valve?

It depends on the body, not the valve type. Bronze gate valves are built to MSS SP-80. Gray iron flanged and threaded gate valves are MSS SP-70. Cast steel bolted-bonnet gate valves 2 in and larger for petroleum service are API 600; compact forged steel valves generally under 2 in are API 602; corrosion-resistant bolted-bonnet gate valves (CF8M and similar) are API 603. Waterworks resilient-wedge valves are AWWA C509 or C515, usually with AWWA C550 fusion-bonded epoxy coating. ASME B16.34 sets the pressure-temperature ratings and B16.10 the face-to-face. One distributor gate valve tree contains all of these, and a value list built for one family will not hold the others.

Does every gate valve have to be lead-free?

No — and that's exactly why it has to be a field. SDWA Section 1417, as amended in 2011 and effective January 2014, caps lead at a 0.25% weighted average across wetted surfaces for anything used to convey water for human consumption. NSF/ANSI 372 is the certification against that limit; NSF/ANSI/CAN 61 is the separate health-effects standard covering what leaches into the water. Non-lead-free bronze gate valves are still manufactured and legally sold for fire protection, irrigation, industrial process and hydronic service. Manufacturers kept both lines, and the part numbers often differ only by a suffix. Without a lead-free attribute, the two are indistinguishable in search results.

Solid, flexible, or resilient wedge — do these need separate values?

Yes, they're different products. A solid wedge is one piece of metal: strongest, cheapest, tolerant of steam and pipe stress, but it can bind if the body distorts thermally. A flexible wedge is slotted around the perimeter so it can flex and release under thermal movement — standard on cast steel valves for steam and high temperature. A resilient wedge is a ductile iron core fully encapsulated in EPDM and bonded to the wedge; it seals bubble-tight against a flat-bottom body on cold water, which is why AWWA C509/C515 waterworks valves use it, and why it does not belong on steam. Rolling all three up into one 'Wedge' value erases the distinction the spec is written on.

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