Data Sheet

Bulletin 71.1:MR95
3
Introduction
The MR95 Series regulators are compact, large-capacity,
direct-operated pressure regulators (see Figure 1). The units
are available in 1/4 NPT through 2 in. / DN 50 sizes and are
offered in several different end connection congurations.
They are designed to handle pressures up to 1000 psig /
68.9 bar and temperatures up to 650°F / 343°C.
These products can help solve the toughest pressure control
applications. Typical applications include superheated steam,
steam injection, steam tracing, nitrogen purging, boiler feed
water, process chemicals, cooling water, test xtures, wash
tanks, sterilizers/autoclaves, fuel lines, pneumatic supply and
many others.
Features
• Handwheels/Tee Handles—Allow easy pressure
setting changes and are standard on Types MR95LD
and MR95HD, and optional on the Types MR95L,
MR95H, MR95HP and MR95HT regulators.
• Versatile—Can be used with all process media
including air, steam, gas, water, liquids (oils and
process chemicals) and oxygen.
• Tight Shutoff With Elastomer Seats—Metal seats
available for high temperatures.
• Direct-Operated—Design maximizes speed
of response.
• Robust—Up to 1000 psig / 68.9 bar inlet pressure.
• P
1
= P
2
—Inlet equals outlet rating in Types MR95H and
MR95HD up to 300 psig / 20.7 bar.
• Rugged Construction—Available in a variety of body
and spring case materials to address the toughest service
conditions. Severe service elastomers and corrosion
resistant trims are also available and provide excellent
uid compatibility.
Specications (continued)
Main Valve Construction Materials
See Table 8
Trim Materials
See Table 7
Product Dimension
See Figure 3
Common Services and Material Compatibility
See Table 9
• Differential Pressure Capability—Spring-loaded
Polytetrauoroethylene (PTFE) packing and
tapped connections permit pressure loading of the
Types MR95LD and MR95HD spring cases.
• Special Service Capabilities—Optional materials
are available for applications handling sour gases,
cryogenics and superheated steam.
• Large Turndown Ratio—No need for low C
v
trims at
low ows.
• Graphite Gaskets—For high temperature applications
up to 650°F / 343°C (optional).
• Set Pressures up to 400 psig / 27.6 bar
• Multiple End Connection Options—To match
your application.
• Easy Maintenance—Seating parts are easily accessible
by removing the plug on the bottom of the regulator.
• API 614 Compliant—Steel and Stainless steel
constructions meet API 614 requirements.
Principle of Operation
The MR95 Series (refer to Figure 2) is a direct-operated
regulator. Downstream pressure is registered internally
or externally through a control line to the under side of
the diaphragm. When the downstream pressure is at or
above the set pressure, the disk is held against the orice,
restricting uid ow through the regulator. When demand
increases, downstream pressure drops slightly allowing the
spring to extend, moving the stem down and the disk away
from the orice. This allows uid ow through the body to
the downstream system. Types MR95H, MR95L, MR95HP
and MR95HT use spring force to regulate outlet pressure.
Types MR95HD and MR95LD use spring force to maintain
a differential pressure between spring case loading
pressure and outlet pressure.
Approximate Weights
MR95H Series
1/4 NPT body: 5 lbs / 2.3 kg
1/2 in. / DN 15 body: 10 lbs / 4.5 kg
3/4 and 1 in. / DN 20 and 25 bodies:
22 lbs / 10 kg
1-1/2 and 2 in. / DN 40 and 50 bodies:
55 lbs / 25 kg
MR95L Series
1/4 NPT body: 7 lbs / 3.2 kg
1/2 in. / DN 15 body: 15 lbs / 6.8 kg
3/4 and 1 in. / DN 20 and 25 bodies:
35 lbs / 16 kg