Non-rising stem
Stops torque from the adjustment screw reaching the disk and seat, in a smaller frame.
Compact spring loaded
8100 and 8500
A state of the art soft seat, high flow rate design in a smaller frame. With a non-rising stem and compact body, the 8100 and 8500 suit all those tight spaces where you still need a safe, reliable valve.
- Set pressure
- 15 to 2,000 psig103 to 13,790 kPag
- Orifices
- E and G
- Service
- Air, gas, liquidLiquid on 8100 only
- Code
- ASME XIIIUV stamped
Tap a point to look insideFive parts that make the 8100 / 8500 work.
Overview
8100 and 8500 at a glance
Both series are manufactured to the ASME Boiler and Pressure Vessel Code, Section XIII, for UV stamped applications. They share the 9100's soft seat and fully guided disk design, with consistent set pressures and a field proven tight lip seal.
The 8100 is designed for air/gas and liquid service from 15 to 2,000 psig. The 8500 is designed for air/gas service from 15 to 1,650 psig.
Where it's used
- Tight spaces
- Air and gas service
- Liquid service (8100)
How it works
Watch the valve pop and reseat.
A spring holds the disk on the seat until system pressure reaches set. Then the valve pops to full lift, relieves, and reseats once pressure drops through the blowdown.
ClosedSpring force holds the disk on the lip seal seat. Pressure is below set.
- Closed
- Pop
- Relieving
- Reseated
Tap a step to jump to it in the cutaway.
Animated cutaway for illustration. Blowdown varies by size, service and setting.
Models at a glance
Compare the 8100 / 8500 range
Ranges from Mercer's published figures. kPag conversions are rounded.
| 8100 | 8500 | |
|---|---|---|
| Service | Air, gas and liquid | Air and gas |
| Orifices | E, G | E |
| Set pressure (psig) | 15 to 2,000 | 15 to 1,650 |
| Set pressure (kPag) | 103 to 13,790 | 103 to 11,376 |
Pressure check
Will a 8100 / 8500 cover your set pressure?
Type your set pressure. If it falls outside the range, we'll point you at the series that covers it.
Enter a set pressure above zero.
Covered
Auto Seat Technology®
What's inside a 8100 / 8500
The Auto Seat features that do most of the work in this series.
Low spring rates
Pops open more freely without over stressing the spring, for a more accurate set pressure.
Fully guided spring
The spring can't bow when compressed, so set pressure holds.
Mechanical stops
The same lift, and the same capacity, every pop.
Already running 8100 / 8500s?
Recertify them in Brisbane
- Tested as found, with a report on every valve
- Gas service on gas, liquid service on water
- Back on site ready to install, under the Inland Transport Guarantee
Book a recert →or call the workshop on 07 3265 4888
Documents
Manuals, data sheets and certificates
Everything for the 8100 / 8500, downloadable from this site.
IOM
Installation and maintenance manual
How to install, operate and maintain the 8100 / 8500.
Download
Data
Data sheet
Dimensions, orifice areas, materials and pressure ratings.
Download
Cert
Sample verification certificate
The certificate that comes back with every recertified valve.
Download
Warranty
Australian warranty
Mercer Brisbane 1 year and 3 year warranty terms.
View terms →
Other Australian series
Not quite the right valve?
Request a quote
Build your 8100 / 8500 quote
Four quick steps. We'll come back with price and lead time from Brisbane. Or call 07 3265 4888.