US635148A

US635148A - Combined feed and stop valve, & c.

Info

Publication number: US635148A
Authority: US
Inventors: Hermann Schmidt; Gustav Leidenroth
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-07-20
Filing date: 1899-07-20
Publication date: 1899-10-17
Anticipated expiration: 1916-10-17

Description

No. 635-,|48. Patented Oct. I7, |899.

H. SCHMIDT &. G. LEIDENRDTH. COMBINED FEED AND STOP VALVE, c.

(Application led July 20, 1899.) (llo Model.)

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HERMANN SCHMIDT AND GUSTAV LEIDENROTI-I, OF HAMBURG, GERMANY.

COMBINED FEED AND STOF VALVE, ne.

SPECIFICATION forming part of Letters Patent No. 635,148, dated October 17, 1899.

Serial No. 724,501. (No model.)

To all whom, t Uta/y concern.-

Be it known that we, HERMANN SCHMIDT, manufacturer, residing at 62 I'Ierderstrasse, and GUSTAV LEIDENROTH, engineer, residing at 22 Admiralitafstrasse, Hamburg, in the German Empire, subjects of the Emperor of Germany, have invented new and useful Im* provenients in a Combined Feed and Stop Valve with a Guide for the Return-Water Current, of which the following is a specifi. cation. i

As is well known, in the feed-water supply for steam-boilers there is alwaysa non-return valve, (feed-valve,) and between vthis valve and the boiler there is arranged a stop or cutoff valve, which can be closed for the purpose of enabling the non-return valve to be inspected when required to remedy any irregularity in the working. In connection with this arrangement there is, however, the objectionable feature' that at the moment when the forcing action of the feed-pump is reversed into suction the column of water between the boiler and non return valve is thrown against the valve owing to the action ofthe higher pressure in the boiler.- These blows given by the water occur continuously during the working of the feed-pump, and they are the stronger the higher the steam? pressure in the boiler, and they notonly cause a speedy deterioration of the valve and its seat, but they are also responsible for the imperfect working of the valve, the disadvantageous effect increasing directly with higher boiler-pressure and with the quantity of water thrown back during the change of the stroke of the pump-plunger.

According to this invention the aforementioned disadvantages are obviated in the im-` proved combination-valve by reducing the space between the stopvalve and the nonreturn valve to a minimum owing to the latter valve being arranged'in the casing of the stop-valve. Furthermore, the blow from the reduced quantity of water is avoided by causing the return-current to flow in a direction along a guide-wall exactly central, but opposite that of the closing of the valve. In this manner the working of the valve is noiseless -and greater durability is insured.

line 2 2 in Fig. l.

In carrying our invention into effect the part a is connected with the feed-pipe and the end t with the steam-boiler. The valve c of the stop-valve is adapted to be pressed upon its seat by means of the spindle CZ and hand-wheel e or to be lifted off its seat by the same to open the valve. The non-return valve f is guided from below and above, as shown, and is formed with a double contactsurface, so as to reduce its stroke, this hav ing beenfound to be of particular advantage with regard to the motion of the returning' water relatively to the downstroke of the non-4 return valve, as has already before been mentioned.

The water from the feedepipe enters the valve-casing at a and flows through the side passages g g', Fig. 1, into the annular space h and after lifting the valvef passes into the spaces QI andy', Fig. l, and thence through the passageZ into the boring j, the open stopL valve c, and space t into the boiler. The v0l= ume of Water between the boiler and non-return valve thrown back at the commencement of the suction-stroke cannot strike' against the valve, but itsline force is directed along the guide-wall m, formed by the central space j of the valve-casing, onto the cover 7c, while the waves which travel upward through the passage Z in opposition to the downward motion of the valve f allow this 'latter to close gradually and without noise.

valve, and Fig. 2 is a cross-section along the and the stop Valve in a single Casing forthe l opposite direction to the downwardly-moving lo purpose of reducing the Volume of water befeed-valve. tween the boiler and feed-valve at the eom- In testimony whereof We afxoursignatures Ineneement of the suction-stroke, the arin presence of two witnesses. l 5 rangement being such that the line force of HERMANN SCHMIDT.

' the returning water is directed onto the Cover GUSTAV LEIDENROTH.

7c by a guide, formed by the upper wall part Witnesses: m ofthe space jwhile thewaves, which travel E. H. L. MMMENHOFF, upward through the passage Z flow in the OTTO W. HELLMINK.