Style ‘MA’ Valve Assembly Sales Manual Section 160 PRODUCT SPECIFICATION "MA"

Style ‘MA’ Valve Assembly  Sales Manual Section 160 PRODUCT SPECIFICATION "MA"
Sales Manual Section 160
PRODUCT SPECIFICATION "MA"
(For TEMPERATURE REGULATOR Service)
Style ‘MA’ Valve Assembly
FEATURES
• Sizes 3/4" through 2".
• Single-seated, piston balanced, direct-acting only.
• Piston located above steam flow line for
self-cleaning
during operation.
• Fully modulating - provides greater control
sensitivity.
• Choice of end connections.
• Tight closing.
• Quick-disconnect stem construction.
• All moving parts readily removed for inspection and
service.
• Non-sticking poppet - no chatter - no rattle.
• Teflon* chevron maintenance-free stem packing
with highly finished stem.
*Teflon is a registered tradename of the DuPont Company.
GENERAL DESCRIPTION
The "MA" valve is piston balanced with the plug
position dictated exactly by the valve stem position,
and hence any temperature regulator using the "MA"
valve is fully modulating as well as tight closing. The
piston is above the steam flow line.
Direct-acting only
(for heating service)
SPECIFICATIONS
CLOSING
Type: .......................................Single-seated, fully balanced.
Sizes: ............................................................ 3/4" through 2".
Action: ....... Direct-acting only (closes with downward stem
movement). Fully modulating in action. Connections:
Sizes:
3/4 through 1 1/2" - Female threaded unions
(Sil-braze unions available).
2" Size - Flanged, Bronze Class 150 ANSI or Cast
Iron Class 125 ANSI (std).
Materials:
Valve Trim ......(Seat and both plugs) 18-8 stainless steel.
Valve Stem .............. 316 stainless steel (highly finished).
Quick detach type.
Stem Packing .. Stacked Teflon chevrons (spring loaded).
Unions ....................... Bronze (sizes 3/4" through 1 1/2").
Valve Body .......................Brass, sizes 3/a" through 1'/2";
brass or cast iron, size 2".
Capacity:
See Cv ratings on back page.
Downward thrust of the stem closes Pilot Valve (I )
also forcing Main Valve Plug (6) closed. Pressure
between Main Plug (6) and Piston (5) bleeds through
Drain Orifice (7) to the downstream pressure (P2).
The full pressure drop (PI - P2) acts on pilot valve and
main valve areas providing additional force to seat
valve more tightly.
OPENING
Stem moves up, opening Pilot Valve (1) while Pilot
Valve Spring (3) downward force continues to hold
Main Plug (6) on seat. Upstream pressure (P1) enters
through Pilot Valve (1). With pilot valve port area
greater than that of Drain Orifice (7), pressure
between Main Plug (6) and Stationary Piston (5)
quickly becomes equal to upstream pressure (P1) and
the valve is now statically balanced. After pilot plug is
fully lifted against the top of its "cage," further
upward stem movement lifts the Main Valve Plug (6)
easily and exactly with almost no force requirement,
regardless of pressure drop through valve.
SATRV-2
1
Maximum Valve Design Ratings:
(Supply Pressure and Allowable Pressure Drop)
Maximum Pressure at 100 'F.: 3/4" – 1 1/2" sizes, 250 psi; 2"
bronze, 150 psi; 2" cast iron, 175 psi.
Maximum Temperature: 3/4" – 1 1/2" sizes: 400°F. at 250 psi; 2"
bronze, 450°F. at 150 psi; 2" cast iron, 353°F. at 125 psi.
Maximum Pressure Drop: 3/4" – 1 1/2" sizes, 250 psi; 2", 150 psi.
Type "MA" used with self-actuated temperature regulator series.
Maximum Recommended Pressure Drops, PSI*
Valve SATR SERIES
Size, In. RT-1001 RT-1003 RT-1004 RT-1006 RT-1007
(Port)
3/4
250
250
250
250
250
1
250
250
250
250
250
1 1/4
250
250
250
250
1 1/8
250
250
250
250
2(1)
150
150
150
150
2(2)
100
100
100
100
RT-1009
RT-1011
250
250
250
250
150
100
250
250
250
250
150
100
(1) Bronze
(2) Cast Iron
* Supply pressure to valve less any back pressure to valve.
Capacity Ratings
Valve Size In.
3/4
1
1 1/4
1 1/2
2
Cv
9.8
12.8
18.6
26
47.5
NOTE: Maximum factory test
allowable leakage is 0.01 % of
rated valve capacity at 50, 75 and
100 psi.
DIMENSIONS
valve
size
3/4
1
1-1/4
1-1/2
2(l)
N
Flange Flange
Bolt Number Bolt Holes
(Flange) Dia. Thickness Circle Bolts
Dia.
3-7/16
1-1/2 6-15/16
3-7/16
1-1/2
7-1/8
4-5/16
1-7/8
7-1/2
4-5/16 1-15/16 8-1/2
4-15/16 2-3/4
7
6
1/2
4-3/4
4
3/4
D
E
L
(1) Bronze - Class 150 ANSI flanges.
Cast Iron - Class 125 ANSI flanges.
2
Q-4048 (9/00)
Printed in U.S.A.
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