This document provides specifications and installation details for modular reducing valves used in hydraulic systems. It includes:
1) Specifications for three reducing valve models including maximum operating pressures and flows.
2) Details on model number designations and pressure adjustment ranges.
3) Installation drawings and spare parts lists for the valve models.
4) Performance characteristic graphs showing pressure drop and pilot flow rates.
The data presented shows the results of down-sizing and crisis management activity, in a medium-sized industrial company
-----------------------------
Ofer Yuval,Management Consulting,Operations,Strategy,Turnaround,Cost Reduction
The data presented shows the results of down-sizing and crisis management activity, in a medium-sized industrial company
-----------------------------
Ofer Yuval,Management Consulting,Operations,Strategy,Turnaround,Cost Reduction
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The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
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The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
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This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
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• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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1. 3/8, Reducing Valves
For "P" Line: MRP-03- -30/3090
For "A" Line: MRA-03- -30/3090 MODULAR
For "B" Line: MRB-03- -30/3090 VALVES
Specifications / Others
Specifications
Max. Operating Pressure Max. Flow
Model Numbers
MPa(PSI) L/min (U.S.GPM)
MRP-03- -30/3090
MRA-03- -30/3090 25 (3630) 70 (18.5)
MRB-03- -30/3090
In pressure adjustment range "H", if the pressure in the primary side is set
above 20 MPa (2900 PSI) and the pressure in the secondary side is set
below 10 MPa (1450 PSI), the maximum flow is limited to 50 L/min
(13.2 U.S.GPM).
Model Number Designation
F- MRP -03 -B -30
Pres. Adj. Range Design
Special Seals Series Number Valve Size Design Standard
MPa (PSI) Number
F:
Special Seals for MRP : Reducing Valve for P-Line
B: 1-7 (145-1020)
Phosphate Ester MRA : Reducing Valve for A-Line 03 30 Refer to
Type Fluids (Omit H: 3.5-24.5 (510-3550)
MRB : Reducing Valve for B-Line
if not required)
Design Standards: None ........... Japanese Standard "JIS" and European Design Standard
90 ............... N. American Design Standard
Instructions
The minimum adjustment pressure equals the lower Model Graphic Detailed Graphic
limit of either pressure adjustment range (B, H) plus Numbers Symbols Symbols
the tank line back pressure of the next page. This
back pressure should include the value of the T-line MRP-03
pressure drop characteristics of the values stacked to P T B A TA A P B TB
the base plate side of the modular valve.
To make pressure adjustment, loosen the lock nut and
turn the pressure adjustment screw clockwise or anti- MRA-03
clockwise. For an increase of pressure, turn the screw P T B A TA A P B TB
clockwise. Be sure to re-tighten the lock nut firmly
after making adjustment to the pressure.
MRB-03
P T B A TA A P B TB
No.10
2. 3/8, Reducing Valves
For "P","A" and "B" Lines MODULAR
Typical Performance Characteristics
VALVES
Hydraulic Fluid: Viscosity 35 mm2/s (164 SSU), Specific Gravity 0.850
Pressure Drop
PSI MPa
0.3 A&B-Line
40
P
30 0.2
Pressure Drop
20
0.1
10 T-Line
0
0
0 10 20 30 40 50 60 70 L /min
0 4 8 12 16 18 U.S.GPM
Flow Rate
cu.in./min
50
cm3/min
800
Pilot Flow
F
40
600
Pilot Flow
30
400
20
200
10
0
0
0 5 10 15 20 25 MPa
0 1000 2000 3000 3500 PSI
Differential Pressure
(Primary pressure - Secondary pressure)
Pres. Drop at Spool Fully Open (P-Line)
PSI MPa
70 0.5
60 0.4
P
50
0.3
Pressure Drop
40
30 0.2
20
0.1
10
0
0
0 10 20 30 40 50 60 70 L /min
0 4 8 12 16 18 U.S.GPM
Flow Rate
No.11
3. 3/8, Reducing Valves
For "P","A" and "B" Lines MODULAR
Installation Drawing / Spare Parts List
VALVES
MRP-03- -30/3090
DIMENSIONS IN
MRB-03- -30/3090 MILLIMETRES (INCHES)
7(.28) Dia. Through
Lock Nut 92(3.62)
4 Places
14(.55) Hex. 19 54
(.47)
12
(.75) (2.13)
Thread Size
Model Numbers
14(.55)
P
A B
"C" Thd.
(1.81)
(2.76)
MB -01- -30 Rc 1/4 = 1/4 BSP.Tr
46
70
TA TB
MB -01- -3090 1/4 NPT
Fully Extended
(.07)
1.8
Pressure Adj. Screw 132(5.20)
14(.55) Hex.
Fully Extended 233.5(9.19)
INC.
Pressure Gauge Connection
"C" Thd.
(2.17)
55
(1.08)
Approx. Mass............ 3.8 kg (8.4 lbs.)
27.5
MRA-03- -30/3090
Fully Extended 233.5(9.20)
47.5
Pressure Gauge Connection (1.87)
"C" Thd.
P
A B
TA TB
Approx. Mass............ 3.8 kg (8.4 lbs.)
For other dimensions, refer to "MRP-03" drawing above.
Spare Parts List
MRP-03- -30/3090 MRB-03- -30/3090
11 10 3 5 15 18 16 3 4 1 2 19 9 17 13
6 7 14
List of Seals
MRA-03- -30/3090
Item Name of Parts Part Numbers Qty. Remarks
14 O-Ring SO-NB-A014 5
15 O-Ring SO-NA-P6 1
Included in Seal Kit
16 O-Ring SO-NB-P16 1 Kit No.:
KS-MRP-03-30
17 O-Ring SO-NB-P18 1
18 O-Ring SO-NB-P26 1
CAUTION
When making replacement of seals, please do it carefully after reading
through the relevant instructions in the Operator's Manual.
No.12