|
General Features & Highlights of Piston
Valve
- Seat less & Glandless valves
- Piston Valves are maintenance free
- Sealing rings easily replaced online
- Adapts as regulating valve
The Bubble tight seal is formed by:
The cylindrical piston precision-ground
stainless steeel
The resillient sealing rings-made from
specially, imported material
The load on the bonnet nuts compresses
The load on the bonnet nuts compresses
THE BUBBLE TIGHT SEAL IS FORMED BY :
1.THE CYLINDRICAL PISTON PRECISION-GROUND STAINLESS STEEL.
2.THE RESILLIENT SEALING RINGS-MADE FROM SPECIALLY
IMPORTED MATERIAL
3.THE LOAD ON THE BONNET NUTS COMPRESSES
THE RESILIENT SEALING RINGS FIRMLY ROUND
THE PISTON TO GIVE A PRESSURE-TIGHT SEAL
ENDS FLANGED & DRILLED TO DIN. BS-10, ANSI, ETC OR SOCKETWELD / SCREWED TO
B.S.P, B.S.P.T, N.P.T,
BRIEF
DETAILS OF PISTON VALVE
It is a Seat less & Glandless
valve
The valve up to the size 6” does not have any stuffing box. The salient
feature of this valve is that of the piston operation.
The piston slides between the two packing rings made of asbestos PTFE and
does not rotate; hence there is minimum ware.
The only warring part is the packing ring and that to after an extensive
use. A ported lantern bush separates the two packing rings.
The bottom ring rests on a cast machined groove of the body and upper
packing ring is being held and remained pressed by a bonnet on top.
The bonnet rests on the top ring, when tightened evenly by the nut of the
stud presses the lantern bush, which in turn presses the bottom ring. This
is done by keeping the valve in closed position.
Thus the mechanism is aligned compressed and ready for operation. Here the
bottom ring of the valve serves the purpose of the seat while the upper ring
serves the purpose of a gland.
The advantage of the valve is when any leakage is observed from the hole of
the bonnet, specially provided for this purpose; it can be stopped on the
line. This is done by tightening the nut of the bonnet evenly, keeping the
valve in closed position.
The maximum thickness of the ring is utilized and when the valve cannot be
further tightened to stop the leakage, It is only required to replace the
packing rings. This can be done on the line itself. The pressure drop in
this valve is considered as high as 18%.
APPLICATION :
The valve finds it's best
application in control of steam & thermic fluid line. The valve also has
numerous applications in the control of liquids and gases also.
RANGE :
The valves can be supplied in
various metal constructions to suit the condition. The valves are available
in ND/16 and ND/25 rating. The flange of piston valve can be supplied in
accordance to BS, DIN, ASA, IS dimensions. The range for the valve is from
15 mm to 150mm
ACTUATION
:
The valves can be supplied with
electrical and pneumatic actuation
| |
|
No. |
Part |
Material
|
|
1 |
Body
|
C.IIS 210 Gr.20-25 (Cast Iron)
ASTM A 216 Gr.WCB (Cast Steel) |
|
2 |
Bonnet |
-
C.IIS 210 Gr.20-25 (Cast Iron)
¨ ASTM A 216 Gr.WCB (Cast Steel) |
|
3 |
Piston |
AISI 410 / 304 / 316 |
|
4 |
Lantern Bush |
AISI 410 / 304 / 316 |
|
5 |
Spindle |
AISI 410 / 304 / 316 |
|
6 |
Sealing Rings |
To Suit Service |
|
7 |
Yoke Bush |
Gun Metal (G.M.) |
|
8 |
Indicator |
Mild Steel (M.S) |
|
9 |
Hand Wheel |
Cast Iron (C.I ) |
|
10 |
Belleville Washers |
Cr.V.Spring Steel |
|
11 |
Studs Nuts |
ASTM A –193 / 194 |
|
12 |
Wheel Nut |
Mild Steel (M.S) |
|
13 |
Set Screw |
Mild Steel (M.S) |
|
14 |
Spindle-Lock Nut |
AISI 410 /304 / 316 |
|
|
| |
|
Weight of Piston valves in Kg. (approx) |
|
SIZE |
15 |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
150 |
|
Flange type |
3.7 |
4.7 |
6.8 |
11.5 |
12.0 |
18.0 |
27.0 |
35.5 |
54.5 |
145.0 |
|
Screwed type |
2.0 |
2.5 |
3.8 |
8.5 |
10.5 |
13.0 |
0 |
0 |
0 |
0 |
|
|
| |
|
|
| |
|
Flanges as per ANSI B 16.5 Class 150 (RF) |
|
SIZE |
PORT |
L |
H |
H1 |
OD |
B |
O9 |
f |
KPCD |
N |
OJ |
OWh |
Ods |
Lift |
|
15 |
15 |
130 |
130 |
160 |
89 |
11.1 |
35 |
1.58 |
60.3 |
4 |
15.9 |
80 |
14 |
30 |
|
20 |
20 |
150 |
140 |
172 |
98.4 |
12.7 |
43 |
1.58 |
69.9 |
4 |
15.9 |
120 |
14 |
32 |
|
25 |
25 |
160 |
167 |
207 |
108 |
14.3 |
51 |
1.58 |
79.4 |
4 |
15.9 |
140 |
16 |
38 |
|
32 |
32 |
180 |
205 |
250 |
117 |
15.9 |
63.5 |
1.58 |
88.9 |
4 |
15.9 |
160 |
18 |
45 |
|
40 |
40 |
200 |
225 |
275 |
127 |
17.5 |
73 |
1.58 |
98.4 |
4 |
15.9 |
180 |
20 |
50 |
|
50 |
50 |
230 |
250 |
311 |
152.4 |
19 |
92 |
1.58 |
120.6 |
4 |
19 |
200 |
22 |
55 |
|
65 |
65 |
290 |
|
|
178 |
|
|
|
139.7 |
4 |
19 |
|
|
|
|
80 |
80 |
310 |
|
|
190 |
|
|
|
152.4 |
4 |
19 |
|
|
|
|
100 |
100 |
350 |
|
|
229 |
|
|
|
190.5 |
8 |
19 |
|
|
|
|
150 |
150 |
480 |
|
|
279 |
|
|
|
241.3 |
8 |
22.2 |
|
|
|
|
|
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