US1336451A - Steam-valve - Google Patents

Description

J. WALLACE AND T. R; LEES.

STEAM VALVE.

APPLICATION FILED DEC. I8, 1917- 1,336,451, Pat nted Apr. 13, 1920.

[7 W 3 SHEETS-SHEET 1.

J. WALLACE AND T. R, LEES.

' STEAM VALVE.

APPLICATION FILED DEC. 18, (917.

1, Patented. Apr. 13, 1929 3 SHEETSSHEET 2.

]. WALLACE AND T. R. LEES.

STEAM VALVE.

APPLICATION FILED DEC. 18, 191.7-

1,336,451. v Patented Apr. 13, 1920.

3 SHEETS-SHEET 3- JOHN WALLACE, OF HELENSBURGH, SCOTLAND, AND THOMAS ROBINSON LEES, OF

SHIREHAMPTON, ENG-LAND.

STEAM-VALVE.

Specification of Letters Patent.

Patented Apr. 13, 19. 0.

Application filed December 18, 1817'. Serial No. 207.732.

To all who/12. it may concern:

Be it known that we, JOHN lVaLLAce and unis Rosmsox liens, subjects of the l 5 or the clnited Kingeom of Great Britain and Ireland, and residing at Helensburgh, Scotland. and Shirehanipton, England, respectively, have invented a certain new and useful Improvement in Steaml alves. oil' which the following is a specification.

This in ention relates to a valve device more particularly to a valve device for con trolling the supply of steam for the operation of winches, and has for its primary object to provide a construction which avoids the drawbacks associated with the throttlin of the steam at he usual steam admission valve employed for controlling the winch. A further object is to provide a construction of valve device which will serve two cylinders simultaneously.

The invention is illustrated in the accompanying drawings in which Figure 1 a 'longitudinal section of the complete valve device; Figs. 2, 3. t and 5 transverse sections through one oi the pistons of the valve proper; 6 and 7 are transverse sections through the valve chamber; Fig, 8 is a developed view of a spring interposed between the inner members of the valve chamber; 9 is a longitudinal section and Fig. 10 a sectional plan of a steam winch to which is applied a valve device according to the invention. Fig. 11 is a detail view of the control lever and cooperating parts.

it valve device according to the invention comprises a central rotary valve proper comng a pair of balanced pistons l, 2, rod with ports 3. 5 adapted in the rotation of the valve to register alternately with ports 4 in the valve ciamher. When the ports 3 register with the ports communication is open between the steam space A and the steam admission side of the cyliir ders B. l/Vhen the ports 5 register with the ports l, communication is open between the exhaust space C and the exhaust side of the cylinders B. For the purpose of maintaining steam tightness of the valve and freedom from liability of the valve proper sticking in the valve chamber, the chamber is constituted by radially spaced coaxial members or" which each inner memher 7 is of semi-annular form, the spaces between the outer member 8 and the inner members 7 being in communication with the steam spaces A whereby the inner mem bers 7 are forced inwardly; there being also accommodated in the spaces between the inner members 7 and outer member 5 springs 9 which act to hold the inner members 7 in position. To talc-3 up -zxprinsion in :i direction endwise of the valve chamber, there interposed between the two inner members '7 a spring 10 tending to separate the adjacent ends of the inner members '7 and to force the remote ends .ro'ainst flanges or seating portions 11 at the ends of the chamber.

The valve proper receives rotary movement through miter gears 12 from the crank shaft 13. A single control lever to is manually operable to impart endwise movement to the valve spindle l6 and thereby to the pistons l. whereby to vary the extent of opening of the steam admission and exhaust ports 3 and 5.

This result is effected by reason of the fact that the said control lever is, in the construction shown in Fig. 11, attached to a shaft 17 having fixed arms 18 between which is mounted a block 19 notched to engage a flange on a collar 20 fixed to the valve spindle 16 to which is attached an exten tion 16 having a splinet sliding connec tion with a sha'tt 16 rotating with the gear 12: so that by adjusting the control lever 15 to different positions the steam admission and exhaust ports will be opened more or less as may be desired. In the construction shown in Fig. 9 the notched block 19, movable with the lever 15, abuts against a sliding member 2i slot-ted to receive a pivoted block also movable with said lever and the shaft- 17.

As horeinbofore indicated. when. in the operation of the device. the ports 3 register with the ports 4 communication is open between the steam space A and the steam admission sides of the pistons in the cylinders B. and when the ports 5 register with the ports-lcommunication is open between the exhaust sides of the pistons in said cylinders B and the exhaust space C.

lVhat we claim is:

1. The hereiinlescribed valve device, comprising. in combination, a valve chamber including a ported cylindrical outer member, inner members of semi-annular form coaxial 5 outer member and said inner members urging said inner members in radical direction, a spring between said inner members urging said inner members apart in axial direction, and a rotary central Valve comprising 10 a pair of balanced pistons fitted within said chamber.

2. The herein described valve device, comprising, in combination, a valve chamber including a cylindrical outer member, inner members of segmental form coaxial with and spaced radially from said outer member, the spaces between said outer member and the inner members being open to receive steam, resilient means interposed between said outer member and said inner members urging said llTl'lGlT members in radial direction, resilient} means between said inner members urging said inner members apart 1n axial direction, and a rotary central valve comprising a pair of balanced pistons, fitted within said chamber.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOHN WVIXL'LAOE. THOMAS ROBINSON LEES.

Witnesses HENRY MASON, FLORENCE HoUs'roN.

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