e x c e l l e n c e o f I t a l i a n e n g i n e e r i n g

Field adjustable PRESSURE RELIEF VALVES

3

RELIEF VALVES

e x c e l l e n c e o f I t a l i a n e n g i n e e r i n g

We started in 1960 as instrumentation manufacturers and we have increasingly specialized in high quality valves.

Italian know-how and production, combined with qualified European suppliers, make Sami the excellence of Italian engineering.

OUR MISSION:

RELIEF VALVES

4

WHAT:

Relief valves are devices which protect the system from overpressure by draining the fluid

when the pressure exceeds a set value.

Relief valves are used:

•insystemsorcontainerswhereit’simportant

to protect the equipment from overpressure;

•withhigh or low temperature fluids;

•tocontroloverpressurecausedbyheat

expansion of a fluid;

•wherethelow drain rate in high pressure

systemsisn’tacriticalfactor;

•wherea“bubble tight” seal is requested.

NOT to be used:

•below 1.000 psi (69 bar);

•in systems where the relief valves must have

a capacity rating at a given pressure rise: our product is designed to open gradually when the pressure increases;

•in systems with ASME Boiler and Pressure Vessel Code or 97/23/EC standards: our relief valves do not comply with ASME or PED standards;•where back pressure during drain may occur;

•with corrosive fluids or liquid nitrogen, which, in the expansion phase, could generate cryogenic temperature gas, damaging the valve.

The valve OPENS when the pressure exceeds a set

value and CLOSES when it falls below.

Normal state:Force of pressure on stem ‹ force of pressure of

spring = CLOSED

Overpressure:Force of pressure of system › force of pressure ofspring = stem lifts and valve OPENS

The set pressure is easily adjusted by the customer

by turning a screw on the top of the valve

Please note: Sami’spressurereliefvalvesareunidirectional, are not to be plugged or plumbed in series and must have an independent exhaust to atmosphere.

WHERE: WHERE NOT:

HOW:

5

RELIEF VALVES

MAIN FEATURES:

CODING SYSTEM:

RELIEF VALVES

Other materials available upon request.

R10 M01 T01 ASERIESR10 RELIEF VALVE 10.000 psiR20 RELIEF VALVE 20.000 psi

TYPEM01 SCREW ADJUSTABLE RELIEF VALVE - SOFT SEAL - ORIFICE 0,07”

SIZET01 1/4” C&T T11 1/4” NPTT02 3/8" C&T T12 3/8” NPTT03 9/16” C&T

MATERIALSA Aisi 316 (standard)

Field adjustable set pressurecan be set in factory and readjusted in the plant, if needed

Long lifethanks to soft seat and strong coil springs

High accuracydesigned to control minor overpressure

Fast responsethanks to a simple structure, with few mechanical components

Easy to useall you need is a screw to adjust the set pressure

Easy maintenancewith few spare parts and easy-to-reach seat

Bubble tightthanks to soft seat based on a tilt angle

RELIEF VALVES

6

TECHNICAL FEATURES:

SET PRESSURE:

The upstream pressure at which the first indication of flow occurs determines the set pressure.

The table above shows the set pressure which can be reached by compressing the internalspring at a given height “h”.The maximum set pressure can be reached at approximately 25% of the total spring length.

The values are to be regarded as an indication and refer to working conditions at room temperature (-29°C + 38°C / -20°F + 100°F).

A tolerance value of ±10% must be considered.

Inlet NPT-F: 1/4” – 3/8”; C&T: 1/4” - 3/8” - 9/16” female

Outlet 1/4” NPT-F

Design and set pressureFrom 1.000 to 10.000 PSI (69-689 bar) for model

R10M01*** From 10.000 to 20.000 PSI (689-1378 bar) for model R20M01***

Cv/Kv 0.12 / 0.10

Full rate Overpressure: 10% higher than set pressure (approx. 5mm opening)

Working temperature Standard -46°C /+150°C (-50°F/ +302°F)

Body material AISI 316

Packing material Nylon or PTFE

O-rings material FKM

Orifice 1.8 mm (0.07”)

Standard testing Shell test at 1.5 x rating - medium: water Seat test at set pressure - medium: water

Certificate included(free of charge) EN 10204 3.1

Set pressure adjustment 100% in plant or in factory

Medium to be used Water or gas

Spring compression R10M01T11 R20M01T01

% h-mm (inch) Psi (bar) Psi (bar)

5 2,6 (0,10”) 1.937 (133) 3.970 (274)

15 7,6 (0,30“) 5.812 (400) 11.908 (821)

25 12,7 (0,50“) 9.687 (668) 19.846 (1368)

H

7

RELIEF VALVES

TABLE OF MATERIALS:

REPAIR KIT CODES:

Valve code Repair kit code

R10M01** KR10M01**

R20M01** KR20M01**

PART DESCRIPTION MATERIAL

1 Upper thrust washer ASTM A276/A479 316

2 Thrust bushing PTFE

3 O-ring 2032 FKM Endura V91A

4 Bottom thrust washer ASTM A276/A479 316

5 Bottom spring AISI 302

6 Shutter AISI A564 T630 H900

7 Bushing ASTM A276/A479 316

8 Seat Nylon or PTFE

9 Socket set screw 1/2” UNC x 2” ASTM A193 GR. B8M

10 Hexagon low nut 1/2 UNC-2H ASTM A194 GR. 8M

11 Upper fitting ASTM A276/A479 316

12 Upper spring bushing ASTM A276/A479 316

13 Springs Carbonsteel

14 Lower spring bushing ASTM A276/A479 316

15 Valve body ASTM A276/A479 316

16 O-ring 2050 FKM Endura V91A

17 Closure fitting 1/4” NPT-F ASTM A276/A479 316

1*2*

3*

8*

4*

5

6

7

9

11

15

17

16*

1213

14

10

Parts marked in BOLD are the ones included in the repair kit.

SAMI INSTRUMENTS® S.r.l.Via Botte, 8 - Reschigliano di Campodarsego 35011 - Padova (Italy) Tel. +39.049.9201939 info@samivalves.comwww.samivalves.com

OVER 50 YEARS OF SUCCESS: