Woodland Piston & Pinch Valves

PISTON VALVES
SEATLESS & GLANDLESS VALVES.
PISTON VALVES ARE MAINTENANCE FREE.
SEALING RINGS EASILY REPLACED ONLINE.
ADAPTS AS REGULATING VALVE.
THE BUBBLE TIGHT SEAL IS FORMED BY: 1. THE CYLINDRICAL PISTON PRECISION-GROUND STAINLESS STEEL 2. THE RESILLIENT SEALING RINGS-MADE FROM SPECIALLY IMPORTED MATERIA 3. THE LOAD ON THE BONNET NUTS COMPRESSES THE RESILIENT SEALING RINGS FIRMLY AROUND THE PISTON GIVES 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, ETC. Sr.No.

Part

Material

1

Body

♦ ♦

2

Bonnet

3 4 5 6 7 8 9 10 11 12 13 14

Piston Lantern Bush Spindle Sealing Rings Yoke Bush Indicator Hand Wheel Belleville Washers Studs Nuts Wheel Nut Set Screw Spindle-Lock Nut

♦ C.IIS 210 Gr.20-25 (Cast Iron) ♦ ASTM A 216 Gr.WCB (Cast Steel) AISI 410 / 304 / 316 AISI 410 / 304 / 316 AISI 410 / 304 / 316 Specially treated & graphite asbestos Gun Metal (G.M.) Mild Steel (M.S) Cast Iron (C.I ) Cr.V.Spring Steel ASTM A –193 / 194 Mild Steel (M.S) Mild Steel (M.S) AISI 410 /304 / 316

SIZE Flange type Screwed type

15 3.7 2.0

20 4.7 2.5

C.IIS 210 Gr.20-25 (Cast Iron) ASTM A 216 Gr.WCB (Cast Steel)

Weight of Piston valves in Kg. (approx) 25 32 40 50 65 6.8 11.5 12.0 18.0 27.0 3.8 8.5 10.5 13.0 0

80 35.5 0

100 54.5 0

150 145.0 0

WOODLAND ENGINEERS H.O & SALES OFFICE: 7, Juhu Gulmohar, Gulmohar Main Road, Juhu, Mumbai – 400 049 Telefax: 91 22 2623 8208 Mobile: +91 998 718 8208 EMAIL: [email protected] URL: www.woodlandengineers.com

SIZE 15 20 25 32 40 50 65 80 100 150

PORT 15 20 25 32 40 50 65 80 100 150

L 130 150 160 180 200 230 290 310 350 480

H 130 140 167 205 225 250 198 327 374 477

Flanges as per ANSI B 16.5 Class 150 (RF) H1 OD B O9 f KPCD 160 89 11.1 35 1.58 60.3 172 98.4 12.7 43 1.58 69.9 207 108 14.3 51 1.58 79.4 250 117 15.9 63.5 1.58 88.9 275 127 17.5 73 1.58 98.4 311 152.4 19 92 1.58 120.6 178 22 122 1.6 139.7 190 19 127 1.6 152.4 229 23.9 157 1.6 190.5 279 25.4 216 1.6 241.3

N 4 4 4 4 4 4 4 4 8 8

OJ 15.9 15.9 15.9 15.9 15.9 19 19 19 19 22.2

O wh 80 120 140 160 180 200 250 250 280 360

Ods 14 14 16 18 20 22

Lift 30 32 38 45 50 55

SIZE 15 20 25 32 40 50 65 80 100 150

PORT 15 20 25 32 40 50 65 80 100 150

L 130 150 160 180 200 230 290 310 350 480

H 130 140 167 205 225 250

Flanges as per ND-10 DIN to 2632 - 33 (RF) H1 OD B O9 f KPCD 160 95 14 45 2 65 172 105 16 58 2 75 207 115 16 68 2 58 250 140 16 78 2 100 275 150 16 88 3 110 311 165 18 102 3 125

N 4 4 4 4 4 4

OJ 14 14 14 18 18 18

O wh 80 120 140 160 180 200

Ods 14 14 16 18 20 22

Lift 30 32 38 45 50 55

SIZE 15 20 25 32 40 50 65 80 100 150

PORT 15 20 25 32 40 50 65 80 100 150

L 130 150 160 180 200 230 290 310 350 480

H 130 140 167 205 225 250

Flanges as per ND – 40 DIN to 2634 – 35 (RF) H1 OD B O9 f KPCD N 160 95 16 45 2 65 4 172 105 18 58 2 75 4 207 115 18 68 2 85 4 250 140 18 78 2 100 4 275 150 18 88 3 110 4 311 165 20 102 3 125 4

OJ 14 14 14 18 18 18

O wh 80 120 140 160 180 200

Ods 14 14 16 18 20 22

Lift 30 32 38 45 50 55

SIZE 15 20 25 32 40 50

PORT 15 20 25 32 40 50

Butt / socket weld L 100 120 135 160 185 220

H1 159 171 207 245 274 311

SEAT BODY

L1 10 13 13 13 13 16

Screwed Ends D 29 35 43 50 58 71

D1 21.7 27.1 33.8 41 48.6 61.1

SIZE 15 20 25 32 40 50

PORT 15 20 25 32 40 50

TESTING PRESSURE HYDROSTATIC ND-10 ND-25 ND-40 2 2 Kg /Cm Kg /Cm Kg /Cm2 10 25 40 16 40 64

L 100 120 135 160 185 220

H1 159 171 207 245 274 311

L1 10 13 13 13 13 16

D 29 35 43 50 58 71

D1 21.7 27.1 33.8 41 48.6 61.1

PNEUMATIC Kg / Cm2 5 5 Woodland Engineers

Brief Write-up Piston valve is a Seatless & 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 specially treated & graphite asbestos and do 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 its 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 Woodland Engineers Telefax: 91 22 26238208 Mobile: +91 9987188208

Operating Manual .

All WOODLAND Piston valves can be kept permanently tight without trouble Shortly after the valves are first put into service, the cover nuts should be lightly tightened with the valve in the closed position, So as to compress the valve-packing ring firmly around the position. WHEN A LEAK DEVELOPES, do not allow it to continue, because it is easy to correct it with an ordinary spanner. 1> Shut the valve fully. 2> Tighten each cover nuts 1/8th of a turn. 3> If the leak is slight & has not persisted for any length of time, this will be found sufficient, IF NOT, then repeat the process until the valve is steam tight. IT IS IMPORTANT to follow instruction no.1, If the cover nuts are tighten down with the valve open then the bottom ring may be compressed in the passage and get damaged by the Piston when the valve is again closed. NO UNDUE FORCE should be used in tightening the nuts; they should move easily with a standard spanner of the corresponding size & should be tightened equally to avoid tilting of the cover. Also never use a wheel spanner on the hand wheel, as there is no use of any undue force to shut the valve, this may simply damage the spindle. LIFE OF THE RINGS The above process may be repeated as & when required until the rings are worn out & required to be replaced. TO REPLACE NEW PISTON it is a simple matter as they are provided with a machined Horseshoe slot. In some cases the piston are fitted by means of a split washer and nut. To replace new Pistons & new rings, the following points should be noted. • •











All nuts have left hand threads. The pistons are accurately machined & carefully finished, If it is necessary to hold the piston while fitting, then it should be griped between a soft wooden clamp to avoid damaging the surface. Open the valve wide. Remove the cover nuts. Screw down the spindle (turn right) to lift the cover off the studs. Turn the cover so that it rests on top of the studs. Screw spindle up (turn Left) to withdraw piston from rings. Lift off cover parts, taking care to avoid scratching the piston. Use only genuine WOODLAND valve rings. Insert a new ring & drive it gently home using a punch / a short bar metals or wood having a slight small diameter than that of the ring. Tap the punch with the hammer lightly & drive the ring till the bottom of the bore. Replace the lantern bush, it should enter the bottom bore & sit flat on the ring. Insert the top ring by the same way as the bottom.

TO REMOVE OLD RINGS use a tang of an old file or screwdriver bent at right angle to form a hook, now pull out the top ring, lantern bush & then the bottom ring. REPLACE THE VALVE COVER by following the below mentioned points:
See that the piston is in good condition, enter the piston through the passage between the rings and replace the cover.
Screw down the cover nuts lightly, then screw down the hand wheel (turn right) then unscrew (Turn left) drawing the cover into position.
Run the nuts down, shut the valve & tighten with spanner evenly just enough to grip the rings.
Make sure that the cover is sitting square on the valve body. REMEMBER; when the valve is first under service, the cover nuts should be tightened lightly & evenly with the valve in closed position, this will enable to settle the rings firmly around the piston. This will increase the life of the rings & failure to this may result in premature leakage. Also note that that the cover nuts should not be tighten without the BELLEVILLE washers. Woodland Engineers

Pinch Valves
SEATLESS & GLANDLESS VALVES
FIELD REPLACABLE ELASTOMER SLEEVE
ELASTOMER SLEEVE HAVING FOUR REINFORCED LUGS
FLANGED ENDS & DRILLED TO DIN, ANSI, BS-10, IS, ETC.
THIS VALVE INCORPORATES ALL THE DESIGN MODIFICATIONS BASED ON OUR EXPERIENCE & IS OF STURDY CONSTRUCTION TO HANDLE ABRASIVE AND CORROSIVE MEDIA. Sr. No.

Part

Material

1

Body

2

Pinching Bars

3 4&5 6 7 8 9 10 11 12

Elastomer Sleeve Spindle Bridge Lug’s Clamp Spindle Clamp Tie Bars Key Yoke Bush Travel Limit Nut

13 14 15 16

Hand Wheel Hand Wheel Nut Lug Clamp Screw Set Screw

Size S.L L O wh H

Size Valve. Sleeve.

15 108 98 86 169

15 0 0

20 124 114 86 172

25 133 123 100 201

32 152 139 115 212

20 0 0

25 0 0

32 0 0

C.I. IS 210 Gr.20-25 (Cast Iron) C.I. IS 210 Gr.20-25 (Cast Iron) Natural, Neoprene, Butyl, EPDM, Hypalon. etc AISI 410 Cast Steel (C.S) Mild Steel (M.S) Gun Metal (G.M) AISI 410 Mild Steel (M.S) Gun Metal (G.M) Mild Steel (M.S) C.I. IS 210 Gr.20-25 (Cast Iron) Mild Steel (M.S) Mild Steel (M.S) Mild Steel (M.S)

40 165 150 115 225

50 197 179 175 252

65 220 203 175 285

80 260 240 190 333

100 311 291 225 370

125 362 341 270 466

150 412 388 270 521

Weight of Pinch valves in Kg. (approx) 40 50 65 80 100 125 12 15 18 26 34 60 0.6 1.1 1.35 2.1 2.9 4.0

150 66 5.5

200 524 504 375 612

250 640 612 480 738

300 760 730 480 860

200 124 11.7

250 260 14.7

300 325 21.5

WOODLAND ENGINEERS H.O & SALES OFFICE: 7, Juhu Gulmohar, Gulmohar Main Road, Juhu, Mumbai – 400 049 Telefax: 91 22 2623 8208 Mobile: +91 998 718 8208 EMAIL: [email protected] URL: www.woodlandengineers.com

Brief Write-up Pinch valve is a Seatless & Glandless valve.

Pinch valve is a modified version of laboratory pinchcock. A rubber sleeve is protected under a cast iron casting. The fluid passing through does not come in contact with either body covering or any other metal parts of the valve except the sleeve. Hence the body and other metal parts are almost permanently not subjected to the corrosive action of the fluid. The flow through the valve is straight and full as that of a pipeline, when the valve is fully open. Further, the collar of the sleeve eliminates gasket. The valve is simple hand wheel operated of rising wheel type. Therefore the operation of the valve is just simple as other wheel operated valve. The in-between stoppage will allow the desired throttling. Thus

the

valve

offers

positive

control

over

flowing

media.

APPLICATION: Pinch valve finds its best application in handling corrosive slurry, abrasive media, liquid with solid suspensions and many others, which are difficult to handle with seat valve.

RANGE: The flange of the pinch valve can be supplied in accordance to BS, DIN, ASA & IS dimensions

The

range

for

the

valve

is

from

15

mm

TO

300

mm.

ACTUATION: The valve can be supplied with Electrical and pneumatic actuation. Woodland Engineers Telefax: 91 22 26238208 Cellphone: +91 9987188208

Operating Manual THE PINCH VALVE is a modified version of the laboratory pinch cock. A rubber sleeve is protected under a Cast iron or Aluminum split body casting. The valve is a simple hand wheel operated of rising wheel type. The operation of the valve is same as other hand wheel operated valve, it closes when moved in clockwise direction and opens when moved in anticlockwise direction. The in-between stoppage will allow the desired throttling. Thus the valve offers positive control over flowing media. The flow through the valve is same as that of a pipeline, when the valve is in fully opened condition. Further, the rubber sleeve eliminates the need of a gasket. PRELIMINARY PRECAUTION: On receipt of the valve please check the position of the valve, as it is advisable to keep the valve in fully opened condition. Also check the position of the travel limit nut, if found loose then tighten the set screw of the nut. INSTALLATION: The valve can be installed without any gasket unless it is required for some specific purpose. Tighten the nut of the flanges evenly & equally, but avoid too much tightening. After installation check the free movement of the upper & lower pinching bar by opening & closing the valve. The valve is then ready for the service it is installed for. MAINTENANCE: If the valve is found leaking through the seat after sometime even though in fully closed condition, then set the travel limit nut by just taking it 1 or 2 threads above & then tighten. This will allow more room for travelling of rubber sleeve & ensure the valve to zero leakage. This problem sometimes occurs when the sleeve is slightly worn out, when used under abrasive condition. Further, The Rubber sleeve of the valve upto 2” (50mm) have a single lug on either side and it goes into the hollow passage of the pinching bar where it is fixed with the lug clamping screws. In the higher sizes above 2”, the sleeves have two lugs on either sides and are fitted overlapping the pinching bar. DISMANTLING THE VALVE & REPLACING THE RUBBER SLEEVE: When the rubber sleeve is ruptured or totally worn out then it is to be replaced with a new one. In this case first dismantle the valve by following the instructions. 1. Remove the hand wheel. 2. Open the Tie Bar nuts. 3. Disconnect the spindle from the Horseshoe connection and remove it completely with the bridge. 4. REMEMBER not to temper the set screw of the yoke bush, unless if required it should be completely tight. 5. Open out the nuts & bolts of the split body of the valve. 6. Remove the screw of the lugs from both the pinching bars. 7. Now fit the new rubber sleeve & reverse the operation to assemble the complete valve. NOTE: It is advisable to keep a spare rubber sleeve for maintenance purpose, considering the self life of the Rubber as six months when packed & stored in dark. The Pinch valves should be stored in fully open condition only. We also offer complete spares of the valves, but request you to place your order a week in advance.

Woodland Engineers Telefax: 91 22 26238208 Cellphone: +91 9987188208