Piston Valves

Zero leakage Valves

Energy Conservation | Environment | Process Efficiency www.forbesmarshall.com

Forbes Marshall Forbes Marshall Arca Forbes Marshall Codel Krohne Marshall Spirax Marshall Forbes Vyncke
For over six decades, Forbes Marshall has been building steam
engineering and control instrumentation solutions that work for Sandwiched sealing rings
process industries. Today we have evolved into a leader in process
efficiency and energy conservation through technology tie-ups and
focused investments in manufacturing and research. Our joint SS 304
ventures with the world's leading names enable us to deliver
quality solutions in 18 countries. Forbes Marshall is unique in
having extensive expertise in both steam and control
instrumentation. The dual expertise has allowed us to engineer Graphite
industry specific systems that focus on energy efficiency and
Temperature resistant up to 1022ºF
utilities management for diverse sectors such as textiles, food
processing, paper, power, mining, oil and gas, and chemicals.
Our teams consist some of the finest engineers and talent. These
highly trained professionals have developed innovative solutions to
Handwheel
better process efficiencies and help save millions of dollars for our
clients. Our business practices and processes have combined into a Bonnet
singular philosophy of being trusted partners who provide Spindle
innovative solutions. It's a philosophy we are proud to live up to. Belleville Washer

We have long standing partnerships with some of the best names Body
in the control instrumentation industry such as Spirax, Arca, Codel, Upper Sealing Ring
Krohne and Shinkawa, to develop, design and supply innovative
Burnished Piston
solutions for measurement and monitoring of process parameters.
With a combination of specialist knowledge and the latest Lantern Bush
technology, we provide products and solutions to achieve Lower Sealing Ring
optimum efficiency. Our products are a unique combination of
hardware and software that make them reliable and accurate.

• Inline serviceable for long life

Leakage is out, the Piston Valve is in • Larger effective sealing area - 600% more than Globe Valve
• Zero leakage assured across the gland and the seat
What is a Piston Valve? • Durability - piston unexposed to media
The Piston Valve is a seatless and glandless valve. At the heart of • Absence of gland and valve key (cheater bar)
the Piston Valve are the Piston and Sealing Rings. A burnished • Fire proof
piston seals against metal reinforced graphite rings to achieve • Maintenance friendly
bubble tight shutoff. This unique design ensures, long life even • Self cleaning
at high temperatures - upto 425°C (797ºF). • Self lubricating
• Applications - Steam, Superheated Steam and condensate,
Features: Heat Transfer Fluid, Compressed Air
• Burnished Piston and metal reinforced graphite sealing rings • TUV certified ISO 9001 company
• ANSI Class VI (i.e. bubble-tight) shut-off • CRN Approved
• Minimum inventory of spares • PED Approved
• Low co-efficient of friction and low operating torque • Complies with API 598
• In accordance to API 602 standards

Valve Leakage - Two Types

Leakage to Atmosphere Solution
Leakage happens in all Gate / Globe and Ball Valves. This Conventional solution - Bellow Sealed Valve
leakage to atmosphere is also called gland leakage.
Advanced solution - Piston Valve
Leakage is visible. The loss of product / energy and steam
through these leaks are visible to the human eye and is easy to
quantify.
Solutions are available to counter gland leakage.

In-line Leakage Solution

In-line leakage is also known as seat leakage - It happens in all Piston Valve is seat-less and has leakage class VI bubble tight
metal seated valves by design (metal seated valves confirm to shut-off.
Class II / Class IV leakage)
Soft seated valves also suffer from this over a period of time.
This loss however is not visible and is hard to quantify.
You actually DO NOT SEE how much is leaking! Even the best
bellow-sealed valves have this problem by virtue of design.
But Yes ! There is a solution - the Piston Valve.

Comparison with Bellow Sealed Valve Solution

Bellow sealed valves have formed/welded bellows instead of a The Piston Valve is a Glandless Valve. A burnished piston
gland. Bellows rupture over a period of usage - very much seals against metal reinforced graphite rings.
like the bellows in mechanical seals. Such valves reduce gland Ensures zero leakage and long life.
leakage, but don’t reduce inline leakage.
Performance Parameters of Different Types of Isolation Valves
Type of Valve
Parameter Gate Ball Globe FM PistonValve
Size of effective sealing area High Very High Low Very High
Replace gland seal Y Y Y Y**
Replace internals Y Y N/Y Y**
Replace seat N Y N / Y* Y**
Leakage High Low Medium NIL
Purchase cost Low Medium / High Medium / High High
Cost of ownership over 5 to 10 years High Medium High Low

* Valve to be removed from line. ** Can be done inline (Valve need not be removed)

Energy audits of steam systems done at various sites have revealed that valve leakage is a serious concern in the industry. In a typical 5 year old
plant, over 30% of the isolation valves leak.

Cost of Ownership covers not only the purchase cost, but the cost of maintaining inventory of spare valves, spare packings / sealings and seats,
replacement, leakage and labor costs.

PISTON VALVES HAVE THE LOWEST COST OF OWNERSHIP

15NB, 20NB, 25NB, 32NB, 40NB 50NB, 65NB, 80NB, 100NB, 125 NB, 150NB, 200NB
(½”, ¾”, 1”, 1¼”, 1½”) (2”, 2½”, 3”, 4”, 5”, 6”, 8”)

Description Description
Forged carbon steel Piston Valves provide perfect tightness and durability on Cast carbon steel Piston Valves provide perfect tightness and durability on
different media such as steam,superheated steam different media such as steam, superheated steam and condensate, heat
and condensate
, heat transfer fluid, and compressed
. air. transfer fluid,and compressed. air

Size and Pipe Connections Size and Pipe Connections

15NB, 20NB, 25NB, 32NB, 40NB 50NB, 65NB, 80NB,100NB,125NB, 150NB, 200NB
½”, ¾”, 1”, 1¼”, 1½” 2", 2½”, 3”, 4”, 5”, 6”, 8”
Screwed BSPT / NPT ends
. Flange type : ANSI B16.5 with class 150 / 300 ratings
Socket weld ends
.
For ANSI 150 Rating
Limiting Conditions Maximum allowable pressure :19.6 bar g (284 psig) @ 38ºC (100ºF)
Maximum operating conditions for socket weld ends and screwed ends PMO - max.operating pressure : 14 bar g (203 psig) @ 197ºC (387ºF)
are as per ANSI 800 rating and 15/20/25(½", 3/4",1") TMO - max. operating temperature : 425º C (797ºF) @5.5 bar g (80 psig)
PMO - max.operating pressure : 78 bar g (1131 psig) Maximum hydraulic test pressure: 28 bar g (406 psig)
TMO - max.operating temperature : 425°C (797°F)
Cold hydraulic test pressure : 156 bar g (2262 psig) For ANSI 300 Rating
Maximum allowable pressure :51 bar g (740 psig) @ 38ºC (100ºF)
Maximum operating conditions for socket weld ends and screwed ends PMO - max.operating pressure : 41.5 bar g (602 psig) @ 253ºC (487ºF)
are as per ANSI 800 rating and 32/40NB ( ½” to 1”) TMO - max.operating temperature : 425º C (797ºF) @ 28.8 bar g (418 psig)
PMO - max.operating pressure : 41.5 bar g (602 psig) Maximum hydraulic test pressure: 83 bar g (1203.5 psig)
TMO - max.operating temperature : 425°C (797°F)
Cold hydraulic test pressure : 83 bar g (1203.5 psig)

ºF ºC Operating Range : 50-200 NB (2” to 8”)

797 425
A
Temperature ºC / ºF

572 300
392 200 Steam
Saturation
212 100 Curve
B F
0 0
0 10 14* 20 30 40 41.5* 51 bar g
145.0 203.05* 290.07 435.11 580.15 601.90* 739.69 psig
Pressure bar g / psig
The product must not be used in this region
A — B Flanged Class 150 A — F Flanged Class 300
* PMO — Maximum operating pressure
Forbes Marshall-Piston Valve-Forged Carbon Steel

Material: 15 - 25 NB (½"-1") Piston Valve

No. Part Material
1 Body Forged Carbon Steel ASTM A 105 N
2 Bonnet Forged Carbon Steel ASTM A 105 N
3 Piston Stainless ASTM A 276Type 304
4 Spindle Stainless ASTM A 276Type 410
5 Nyloc Nut Carbon Steel Carbon Steel
6 Stud Carbon Steel ASTM A 193 Gr. B7
7 Nut Carbon Steel ASTM A 194 Gr. 2H
8 B. Washer Spring Steel 50Cr V4
9 Sealing Rings S/S Reinforced Graphite
10 Spacer Stainless Steel ASTM A 276Type 410
11 Handwheel Sheet Metal

15 - 25 NB (½"-1") Piston Valve

Always open & close Valve fully
Do not use Valve Key (cheater bar)

Material: 32 - 40 NB (1 ¼"-1½") Piston Valve

No. Part Material
1 Body Forged Carbon Steel ASTM A 105 N
2 Bonnet Forged Carbon Steel ASTM A 105 N
3 Piston Stainless ASTM A 276Type 304
4 Spindle Stainless ASTM A 276Type 410
5 Nyloc Nut Carbon Steel Carbon Steel
6 Stud Carbon Steel ASTM A 193 Gr. B7
7 Nut Carbon Steel ASTM A 194 Gr. 2H
8 B. Washer Spring Steel 50Cr V4
9 Sealing Rings S/S Reinforced Graphite
10 Spacer Stainless Steel ASTM A 276Type 410
11 Handwheel SG Iron
12 Split Nut Brass
32 - 40 NB (1 ¼"-1½") Piston Valve
13 Thrust Plate Stainless Steel ASTM A 276Type 420
Always open & close Valve fully
Do not use Valve Key (cheater bar)

Dimensions: In mm/inches (approximate)

SIZES A B C Approx. Net Weight
END
MM IN CONNECTION MM IN MM IN MM IN Kg Lbs

15NB ½" SC / SW 110 4.33 118 4.65 146 5.75 2 4.41

20NB 3/4" SC / SW 110 4.33 118 4.65 146 5.75 2 4. 41

25NB 1" SC / SW 126 4.96 133 5.24 165 6.50 3.5 7.7

32NB 1 1/4" SC / SW 165 6.50 175 6.89 215 8.46 8 17.64

40NB 1 ½" SC / SW 165 6.50 175 6.89 215 8.46 8 17.64

Due to continuous development of our products, we reserve the right to modify our product design without prior notice.
Forbes Marshall - Piston Valve - Cast Steel

14

50 NB (2”) Piston Valve

Always open & close Valve fully
Do not use Valve Key (cheater bar)

Material : 50 NB (2") Piston VALVE

No. Part Material
1 Body Cast Steel ASTM A 216 Gr.WCB
2 Bonnet Cast Steel ASTM A 216 Gr.WCB
3 Piston Stainless Steel ASTM A 276 Type 304
4 Spindle Stainless Steel ASTM A 276 Type 410
5 Nyloc Nut Carbon Steel
6 Stud Carbon Steel ASTM A 193 Gr.B7
7 Nut Carbon Steel ASTM A 194 Gr.2H
8 B. Washer Spring Steel 50 CrV4
9 Sealing Ring S/S Reinforced Graphite
10 Spacer Stainless Steel ASTM A 743 Gr.CA 15
11 Handwheel S.G. Iron
12 Thrust Plate Stainless Steel ASTM A 276 Type 420
13 Name Plate Stainless Steel
14 Split Nut Brass

Dimensions: In mm/inches(appr oximate)-ANSI 150

No. of Approx. Net
SIZES ANSI L D PCD H Holes T E(Close) F(Open) Weight
CLASS
MM IN MM IN MM IN MM IN MM IN MM IN MM IN MM IN KG Lbs
50NB 2" 150# 203 8.00 152 5.98 12.60 4.78 19 0.8 4 19 0.75 210 8.27 262 10.31 14.5 32

Dimensions: In mm/inches(appr oximate)-ANSI 300

No. of Approx. Net
SIZES ANSI L D PCD H Holes T E(Close) F(Open) Weight
CLASS
MM IN MM IN MM IN MM IN MM IN MM IN MM IN MM IN KG Lbs
50NB 2" 300# 267 10.51 165 6.50 127 5.00 19 0.8 8 22 0.87 210 8.27 262 10.31 17.5 30

Due to continuous development of our products, we reserve the right to modify our product design without prior notice.
Forbes Marshall - Piston Valve - Cast Steel

65 - 200 NB (2½ " - 8") Piston Valve

Always open & close Valve fully
Do not use Valve Key (cheater bar)
Material : 65 - 200 NB (2½ " - 8") PISTON VALVE
No. Part Material
1 Body Cast Steel ASTM A 216 Gr. WCB
2 Bonnet Cast Steel ASTM A 216 Gr. WCB
3 Piston Stainless Steel ASTM A 351 CF8
4 Body Sealing Stack S/S Reinforced Graphite
5 Spacer Stainless Steel ASTM A 743 C A 15
6 Spindle Stainless Steel ASTM A 276 Type 410
7 Stem Stainless Steel ASTM A 276 Type 304
8 Split Nut Brass
9 LH Nut Stainless Steel ASTM A 276 Type 304
10 Gland Sealing Stack S/S Reinforced Graphite
11 Threaded Bus Ph. Bronze
12 Back Seat Stainless Steel ASTM A 276 Type 410
13 Gland Nut Stainless Steel ASTM A 276 Type 410
14 Bonnet Sealing Ring Graphite
15 Stud Carbon Steel ASTM A 193 GR B7
16 Nut Carbon Steel ASTM A 194 GR 2H
17 Beleville Washer Spring Steel 50 CrV4
18 Handwheel S.G. Iron
19 Nyloc Nut Carbon Steel
20 Washer Stainless Steel ASTM A 276 Type 304
21 Name Plate Stainless Steel
22 Thrust Plate Stainless Steel ASTM A 276 Type 420

Dimensions: In mm/inches(appr oximate)-ANSI 150

No. of Approx.Net
SIZES ANSI L ØD PCD ØH Holes T E(Close) F(Open) Weight
CLASS
MM IN MM IN MM IN MM IN MM IN MM IN MM IN MM IN Kg Lbs
65NB 2½" 150# 216 8.50 178 7.00 140 5.50 19 0.75 4 22 0.87 335 13.19 400 15.75 27 29
80NB 3" 150# 241 9.50 191 7.50 152 5.99 19 0.75 4 24 0.94 320 12.6 384 15.12 31 68
100NB 4” 150# 292 11.50 229 9.02 191 7.50 19 0.75 8 24 0.94 395 15.55 479 18.86 47 103
125NB 5” 150# 356 14.02 254 10.00 216 8.50 22 0.87 8 24 0.94 446 17.56 540 21.46 70 154
150NB 6” 150# 406 15.98 279 10.98 241 9.49 22 0.87 8 26 1.02 486 19.13 598 23.54 90 198
200NB 8” 150# 495 19.49 343 13.50 298 11.73 22 0.87 8 28 1.10 591 23.17 728 28.66 164 362

Dimensions: Im mm/inches (approximate)-ANSI 300

No. of Approx.Net
SIZES ANSI L ØD PCD ØH Holes T E(Close) F(Open) Weight
CLASS
MM IN MM IN MM IN MM IN MM IN MM IN MM IN MM IN Kg Lbs
65NB 2½" 300# 202 11.50 191 7.52 142 5.87 22 0.87 8 25 0.08 335 13.19 400 15.75 31 68
80NB 3" 300# 318 12.52 210 8.27 168 6.61 22 0.87 8 28 1.1 320 12.60 384 15.12 37 82
100NB 4” 300# 356 14.02 254 10.00 200 7.87 22 0.87 8 32 1.26 395 15.55 479 18.86 58 128
125NB 5” 300# 400 15.75 280 1.02 235 9.25 22 0.87 8 35 1.38 446 17.56 540 21.46 87 192
150NB 6” 300# 445 17.52 318 12.52 270 10.63 22 0.87 12 37 1.46 486 19.13 598 23.54 117 258
200NB 8” 300# 559 22.01 381 15.00 330 12.00 22 0.87 12 41 1.61 591 23.27 728 28.66 210 463

Due to continuous development of our products, we reserve the right to modify our product design without prior notice.
Quality Certificates

Environment:
Here at Forbes Marshall we feel responsible for the environment and are actively involved in
conserving the same. We not only offer an array of products that help in conserving our environment
but we also involve ourselves in specific manufacturing process to enhance our sustainability.

All our Piston valves have asbestos free packing. The gland packing is self-adjustable and self-
lubricated which ensures zero gland leakage to the atmosphere even in the long run.

Our Piston valves are accurately designed and have leakage Class VI shutoff. Our ISO 9001 certified
manufacturing capabilities guarantee the functioning of our products and we offer a warranty of 1
year on all our products. All our products are CRN certified.

Ordering Information:
Piston Valve Selection Guide
1 Product Code PSVL
2 Size 15NB 20NB 25NB 32NB 40NB 50NB 65NB 80NB 100NB 125NB 150N 200NB
3 End Connection 1/2" 3/4" 1" 1/4" 11/2” 2" 21/2” 3" 4" 5" 6" 8"
BSPT A A A A A
Screwed (SC) NPT B B B B B
Socket Welded(SW) I I I I I
ANSI 150 Q Q Q Q Q Q Q
ANSI 300 M M M M M M M
4 Material F F F F F C C C C C C C

Not in standard product range, confirmation required when ordering.

END Connection BSPT NPT Socket ANSI ANSI Material Description

Welded 150 300 F Forged Carbon Steel
Code A B 1 Q M C Cast Carbon Steel

How to order
Forbes Marshall 150NB(6”), Cast Steel ANSI 150 Piston valve
product Description : 1 2 3 4 PSVAL150QC

To order any of our Piston Valves, please provide us the following process parameters and let our engineers offer you a solution best suited for
your process:

1) Steam line size

2) End connections for the valve (Socket weld, NPT, BSPT for 1/2" to 1½" and flanged for 2" to 8")

3) Pressure rating (or Pressure and Temperature of the service)

4) Material (Forged carbon steel for 1/2" to 1½" and Cast carbon steel for 2" to 8")

We are proud to offer ideal solutions, through our tacit and explicit knowledge based on 60 years of experience and expertise to meet
customized and complex industry applications. Please call our local representative or head office as per the contact details given behind for
any query or doubt.
 Your local Forbes Marshall representative would be happy to provide you
with further information and support.

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