Name: Pressure Vacuum Relief Valve Tank Breather Valve
Availability: InStock

Pressure Vacuum Relief Valve

Size Range

As configured: 8" inlet / 10" outlet, ASME Cl150 RF flanged. Series range: 2" – 12" inlet (DN50 – DN300), outlet typically one size larger.

Temperature Range

Design: -13°C to +80°C (up to +130°C for kerosene / diesel service). Operating: 15 / 25 / 45°C (min / normal / max).

Set Pressure / Vacuum

Set pressure: +15 mbar(g) (0.015 barg). Set vacuum: -3 mbar(g). Tank design limit: +20 / -4 mbar(g).

Operating Pressure

0.003 / 0.0075 / 0.012 barg (min / normal / max), under nitrogen blanketing control. Back pressure: 0 (direct vent to atmosphere).

Body Materials

Body / bonnet / cover: ASTM A216 Gr. WCB cast carbon steel (standard); optional CF8 / CF8M cast stainless. Seat: metal seat (soft PTFE seat optional for tighter shut-off). Disc / pallet: 316 stainless steel. Nozzle / guide bushing: 316 stainless steel. Spring: carbon steel with corrosion-resistant coating (316 SS optional). Gaskets: PTFE / Viton (FKM) / EPDM per media. Wetted parts hardness-tested per NACE MR-0103.

Design Type

Weight-loaded (gravity operated), closed bonnet, full nozzle, bolted top cap. Purely mechanical — no external power or actuator required.

Capacity (API 2000)

Outbreathing: 4709.2 Nm³/h (blanketing regulator failure open). Inbreathing: 2075.7 Nm³/h (gasoline) / 2216.5 Nm³/h (kerosene) at max pump-out + thermal contraction.

Installation

Tank roof mounted (nozzle N7). Test gag supplied on every unit. Lifting device required for valves over 45 kg.

End Connections

Inlet: 8" ASME Cl150 RF flange. Outlet: 10" ASME Cl150 RF flange. Cl300 / PN16 / PN25 available on request. Inlet pressure drop ≤ 3% of set pressure.

Certification & Rating

NACE MR-0103 required. ASME stamp required. Hazardous area: Class I Zone 2 IIA T3 (purely mechanical; electrical accessories must also meet the rating). Material cert: pressure parts EN 10204 3.1, others 2.2.

Service Media

Gasoline, kerosene, diesel and other low-pressure hydrocarbon vapours. Typical densities 736 – 848 kg/m³. Emergency (fire-case) relief handled separately by ERV hatch, outside PVRV scope.

Design Standard

API 2000 (breathing capacity calculation), tank design +20 / -4 mbar(g). Reference calculation SDM-H-06-PR-CLC-0005.

Applications

Atmospheric and low-pressure storage tanks for gasoline, kerosene and diesel with nitrogen blanketing; internal floating-roof tanks; tank farms and loading terminals; hazardous-area tank protection.

Pressure Vacuum Relief Valve Tank Breather Valve

Working principle:

- Purely mechanical, weight-operated — no external power, air supply or controller required

- Pressure pallet lifts when tank pressure exceeds +15 mbar(g); vacuum pallet opens at −3 mbar(g) to admit air

- Closed bonnet, full-nozzle flow path, bolted top cap for easy on-roof maintenance

Item	Value
Inlet / Outlet	8″ / 10″ ASME RF flanged
Set pressure / vacuum	+15 mbar(g) / −3 mbar(g)
Body	ASTM A216 WCB cast carbon steel /Others according to request
Trim	316 SS disc, nozzle and guide; metal seat; CS coated spring
Outbreathing / inbreathing	4709.2 / 2075.7 (gasoline) – 2216.5 (kerosene) Nm³/h
Design temperature	−13 °C to +80 °C (up to +130 °C diesel/kerosene)
Operating pressure	0.003 – 0.012 barg
Back pressure	0, direct vent to atmosphere
Rating	Class I Zone 2 IIA T3, NACE MR-0103, ASME stamped

Component	Standard Material (as configured)	Optional / On Request
Body / Bonnet / Cover	Carbon steel ASTM A216 Gr. WCB	Cast stainless CF8 / CF8M (304/316)
Seat	Metal seat	Soft seat PTFE for tighter shut-off
Disc / Pallet	316 stainless steel	316L / Alloy trim
Nozzle / Guide Bushing	316 stainless steel	316L / PTFE-lined
Spring	Carbon steel with corrosion-resistant coating	316 stainless steel spring
Gaskets / Seals	Suitable for gasoline / hydrocarbon vapour	PTFE, Viton (FKM), EPDM per media
Top Cap	Bolted carbon steel	316 stainless
Wetted Parts	Hardness tested per NACE MR-0103	NACE MR-0175 / ISO 15156 on request

Unique design of Pressure / Vacuum Relief Valve (safety type)

Weight-Loaded, Mechanical — Gravity-loaded design with no external power or actuator; purely mechanical operation, dependable set pressure for continuous tank service.
Tank Overpressure & Vacuum Protection — Relieves at +15 mbar(g) and admits air at −3 mbar(g), keeping the tank safely inside its +20 / −4 mbar(g) design envelope and avoiding deformation or collapse.
Low Emissions & Vapour Loss — A tight metal seat and close bonnet minimise routine venting, cutting both environmental emissions and evaporation loss of stored product.
NACE & Ex-Rated — NACE MR-0103 compliant, Class I Zone 2 IIA T3 for hazardous area installation; ASME stamped, pressure parts certified to EN 10204 3.1.

Gasoline Storage Tank Pressure Protection
Installed on the roof of atmospheric gasoline storage tanks under nitrogen blanketing. Relieves overpressure during filling, thermal expansion and blanketing-regulator failure, and admits air during pump-out and thermal contraction.

Operating Conditions: Set pressure +15 mbar(g) / set vacuum -3 mbar(g); tank design limit +20 / -4 mbar(g); required outbreathing 4709.2 Nm³/h, inbreathing 2075.7 Nm³/h; gasoline vapour media; operating pressure 0.003 – 0.012 barg; WCB body with 316 SS trim, NACE MR-0103 wetted parts.
Kerosene & Diesel Storage Tanks
Applied to kerosene and diesel tank farms where operating temperature is higher. The closed-bonnet weight-loaded design handles both thermal breathing and pump-out demands while reducing evaporation loss.

Operating Conditions: Design temperature extended to +130°C; operating temperature up to 50°C (kerosene) / 95°C (diesel); inbreathing demand up to 2216.5 Nm³/h; media densities 762 – 848 kg/m³; 8" / 10" ASME Cl150 RF flanged roof installation.
Tank Farms & Loading Terminals
Used in bulk storage tank farms, truck/rail loading gantries and marine terminals where tanks are filled and emptied continuously. Protects tanks from deformation, vacuum collapse and evaporative loss.

Operating Conditions: Frequent filling / pump-out cycles; blanketing regulator failure open as governing outbreathing case (4709.2 Nm³/h); direct vent to atmosphere with zero back pressure; bolted top cap for on-roof maintenance; test gag supplied on every unit.
Nitrogen-Blanketed Atmospheric Tanks
Installed as the independent overpressure / over-vacuum safety device on nitrogen-blanketed tanks. Normal pressure control is handled by the blanketing system; this PVRV acts only as the final relief protection.

Operating Conditions: Operating pressure 0.003 / 0.0075 / 0.012 barg (min / normal / max); set points below tank design +20 / -4 mbar(g); purely mechanical — no external power, air supply or actuator; suitable for continuous unmanned tank service.
Hazardous Area Tank Protection
Engineered for refinery and storage-area installations classified as hazardous. The all-mechanical weight-loaded valve requires no electrical supply and carries the required area classification and sour-service certification.

Operating Conditions: Class I Zone 2 IIA T3 area rating; NACE MR-0103 sour-service wet parts with hardness test; ASME stamp required; pressure parts certified EN 10204 3.1; any electrical accessory must separately meet the area rating.
Internal Floating-Roof (IFR) Tanks
Used on internal floating-roof tanks with aluminium full-contact seals. The roof-mounted breather controls the vapour space pressure above the floating roof during liquid rise, vapour expansion and withdrawal.

Operating Conditions: Tank capacity around 3,000 – 3,500 m³, diameter 19,000 mm; conical roof slope 1:100; tank roof nozzle N7 connection; ambient temperature -13°C to +40°C; inlet pressure drop limited to ≤ 3% of set pressure.

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