YBPRV Series · Safety-Critical · Stainless

Pressure Relief Valve

The safety device every blower line needs. It opens at its set point and vents over-pressure — protecting the motor, the pipework and the process when a line blocks. Stainless-built to stay reliable for years.

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Set-Point Range · Stainless Build · YBPRVYB-FIG-01

0–600 mbar

Set-Point Range: 0–600 mbar
Connection Size: 32–100 mm
Build: Stainless
YBPRV Series: 4 Models

01Why It Matters

A Blower Line Without a PRV Is a Risk

A positive-displacement blower does not know the line is blocked. It keeps pushing air, and if the outlet is throttled, valved shut or clogged, pressure climbs until something fails — the motor overloads, a joint blows, a vessel ruptures. The YBPRV pressure relief valve is the device that stops that happening: it opens at a set pressure and vents the surplus air safely to atmosphere.

This is safety-critical hardware, not an accessory. Every blower and pressurised air line should have a correctly set relief valve as its last line of defence. Four YBPRV models cover a 0–600 mbar set-point range with connections from 32 mm to 100 mm, all in a stainless build that stays free and reliable in the field.

What the valve protects

The blower & motor — from the overload that over-pressure forces on them.
The pipework & vessels — from rupture and joint failure.
The process & the people around it — from a sudden, dangerous release.

02Working Principle

Spring, Set Point, Vent

The mechanism is deliberately simple, because simple is reliable. A calibrated springholds a poppet closed against its seat. In normal running, line pressure is below the spring’s set point and the valve stays shut — no leak, no loss.

When something downstream restricts the flow and pressure rises above the set point, the air force overcomes the spring, the poppet lifts off its seat, and the valve vents the excess to atmosphere. Pressure falls, the spring re-seats the poppet, and the line returns to normal — all automatically, with no power and no operator. That mechanical certainty is exactly what a safety device must have.

Set it right

The set point sits in a window: above your normal working pressure, so the valve does not chatter and leak in ordinary operation, and below the safe limit of the blower and pipework, so it acts before anything is damaged. Choosing that window correctly is the essence of specifying a relief valve.

Sizing the relief, not just the set point

A relief valve has to do more than open at the right pressure — it has to flow enough airto actually cap the rise. If the valve is too small for the blower’s output, pressure keeps climbing even with the valve wide open. So match the connection to the blower’s capacity: the YBPRV range runs 32, 50, 65 and 100 mm precisely so the valve can pass what the blower pushes. Size the connection to the line and the blower duty, not just to a convenient fitting.

Treat the PRV as the last line of defence, not the first. Good practice is to prevent the over-pressure where you can — avoid dead-heading the blower, interlock isolation valves — and let the relief valve stand behind that as the mechanical safeguard that acts no matter what else fails. Fit it, set it correctly, keep it stainless, and test it: a safety device earns its place only when it is proven to work.

03Selector

Choose by Pressure Range & Connection

Set the valve above your normal working pressure and below the safe limit of the line. Then match the connection to your pipe size. Three models cover 0–300 mbar and one covers 300–600 mbar, in connections from 32 mm to 100 mm.

YBPRV-125

32 mm · 151 mm

0-300 mbar

YBPRV-200

50 mm · 184.3 mm

0-300 mbar

YBPRV-250

65 mm · 195 mm

0-300 mbar

YBPRV-400

100 mm · 247 mm

300-600 mbar

04Performance Data

Full Specifications — All 4 Models

Full data for all four YBPRV models — set-point pressure range, nominal connection size, length and weight. Set above working pressure, below the line limit, and match the connection. Tap a model chip to jump to its row.

YBPRV-125 YBPRV-200 YBPRV-250 YBPRV-400

Full specification · 4 models · Series YBPRV

P.R.V Pressure Relief Valve — full technical specification for all 4 models in the YBPRV series.
Model	Pressure	Inlet / Outlet	Length	Weight(kg)	Action
YBPRV-125	0-300 mbar	32 mm	151 mm	0.4	Get Quote
YBPRV-200	0-300 mbar	50 mm	184.3 mm	1.8	Get Quote
YBPRV-250	0-300 mbar	65 mm	195 mm	1.52	Get Quote
YBPRV-400	300-600 mbar	100 mm	247 mm	3.5	Get Quote

05Construction

Stainless Build for the Long Term

A relief valve only earns its place if it still works years after it was fitted — and the way it fails is by seizing. A seized-shut valve gives false confidence and offers no protection at all. That is why the YBPRV is stainless-built.

Stainless steel body & internals: resist corrosion from moisture, condensate, process vapours and outdoor exposure, so the valve stays free.
Calibrated spring:holds a repeatable set point over the valve’s life.
Clean seat & poppet: for a positive re-seat with no creeping leak.
Threaded / flanged connection in nominal sizes 32, 50, 65 and 100 mm to fit standard blower lines.

06Install & Maintain

Installation & Maintenance

Installation

Fit on the pressure line close to the blower outlet, upstream of any valve that could isolate it — the PRV must always see line pressure.
Match the connection to the line size and mount so the vent path is clear and directed safely away from people.
Never plug, throttle or valve-off the relief — that defeats the entire purpose.
Confirm the set point suits your working pressure and the safe limit of the system.

Maintenance

Periodically verify the valve is free and lifts at its set point — test it, do not assume it.
Keep the vent clear of dirt, paint and obstruction.
Inspect after any incident in which the valve actually relieved.

A Relief Valve Must Be Proven, Not Assumed

The dangerous failure of a relief valve is the silent one — a valve that has quietly seized shut still looks fine. Test it; do not trust it on appearance.

Chatters or leaks in normal running — the set point is too close to your working pressure. Raise the set point or reselect a model with the right range.
Does not lift when it should — the valve is seized from corrosion or paint, or the vent is plugged. Free it, keep the vent clear, specify the stainless build, and test at the set point regularly.
Weeps at the seat after relieving — debris on the seat or a worn seat is stopping a clean re-seat. Clean or replace.
Vents too early — set-point drift or the wrong model for the duty. Verify the set point and reselect if needed.
Never relieves at all — an upstream valve is isolating it from line pressure. Relocate the PRV so it always sees the blower line.

07Applications

Wherever Air Is Pressurised

Aeration & effluent treatment — protecting blowers feeding diffuser grids that can foul and block.
Pneumatic conveying — guarding against blockages in the conveying line.
Process & combustion air — relief on blower-fed headers.
Any positive-displacement blower installation where a downstream valve could close against the running blower.

083D / Interactive View

Inspect the Machine Closer

A rotatable 3D model is on the way. Until then the render shows the machine's form, its ports and its mounting arrangement — the same drawing-office view you get on the datasheet.

YBPRV stainless pressure relief valve for a blower line, spring-loaded with atmospheric vent — 3D / Interactive ViewYB-DS-YBPRV

09Export Readiness

Ready to Ship Worldwide

We have shipped to buyers across the Gulf, South-East Asia, Africa and Latin America. Every consignment leaves Faridabad export-packed, documented and correctly classified — quote us your port and Incoterm and we handle the rest.

HS Code: 8481.40.00
Classification: Safety or relief valves — pressure relief valve
Incoterms: FOB / CIF / EXW (Ex-Works Faridabad)
Load Ports: Nhava Sheva (JNPT) · Mundra · Delhi ICD (Tughlakabad)
Export Packing: Cartoned or crated with the machine order; ports protected for transit
Lead Time: 1–2 weeks ex-stock; commonly shipped with the blower it protects
Power / Frequency: Wound for 220–440 V, 50 Hz or 60 Hz on request
Documentation: Commercial invoice, packing list, ISO 9001:2015 certificate, test report, Certificate of Origin

10Frequently Asked Questions

Answers for Specifiers & Buyers

Why does every blower line need a pressure relief valve?

Because a positive-displacement blower keeps pushing air even when the line downstream is blocked or throttled — and pressure then climbs until something gives. A pressure relief valve (PRV) is the safety device that opens at a set point and vents the excess, protecting the blower motor from overload, the pipework and vessels from rupture, and the process from a dangerous over-pressure. It is not optional hardware; it is the safeguard that stops a blocked line from becoming a failure.

How does the PRV work?

A spring holds the valve poppet closed against normal line pressure. When pressure rises above the spring set point — because a valve closed, a filter clogged or a line blocked — the force lifts the poppet off its seat and the valve vents the surplus air to atmosphere. As pressure falls back below the set point, the spring re-seats the poppet. It is automatic, mechanical and needs no power.

How do I set and select the relief pressure?

Set the valve above your normal working pressure — so it does not chatter in normal operation — and below the safe limit of the blower and pipework. Then choose the model: three YBPRV models cover 0–300 mbar and one covers 300–600 mbar, in connections from 32 mm to 100 mm. Match the connection to your line size. Tell us your blower duty and pipe size and we will specify the valve.

Why a stainless build?

Stainless steel resists corrosion from moisture, process vapours and outdoor exposure, so the valve stays free and reliable over years — a relief valve that has seized shut is worse than no valve at all, because it gives false confidence. Stainless keeps the moving parts working when you need them, which on a safety device is the whole point.

Does the PRV need maintenance?

Very little, but do not ignore it. Periodically check that the valve is free and lifts at its set point, keep the vent path clear, and make sure nothing has been done to defeat or plug it. A relief valve is a safety device — verify it works rather than assuming it does.

Do you export the YBPRV pressure relief valve?

Yes, worldwide. Valves ship under HS code 8481 (taps, cocks, valves), export-packed and documented, and are often added to a blower order. Send your blower duty, line size and destination for a combined quote within 24 hours.

11Who Builds It

Since 1998 — 26+ Years of Air Engineering in Faridabad

A safety device is only as good as the maker behind it — 26 years building the blowers these valves protect is that assurance.

Yash Blowers Private Limited has manufactured blowers and vacuum pumps from its ISO 9001:2015 plant in IMT Faridabad since 1998. Machining, assembly, balancing and testing are done in-house — so the machine you buy is the machine we built, backed by a 12-month warranty and a spares network that keeps decades-old units running.

ISO 9001:2015 · Made in India · 12-Month Warranty

1998: Building air machines
26+: Years in the trade
10,000+: Customers served
300+: Units dispatched / day

12Protects These Blowers

Single Stage Turbine Blower

YEBL-1 side-channel blowers on aeration and conveying lines.

High Pressure Series Blower

YEBL-HP blowers where over-pressure protection matters most.

Air Filter Assembly

The other essential blower-line accessory — inlet protection.

Request for Quotation

Get a Quote in 24 Hours

Send your duty point — flow, vacuum/pressure and destination port — and our engineers will size the right YBPRV model and quote FOB, CIF or EXW. Export packing, HS classification and documentation handled in-house.

Direct line: +91 9971006400 · sales@yashblowers.org

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