US3834537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High throughput filter having multiposition valve
Assignee: Hydrotech Chemical Corp
•
Filing: 1973-06-29
•
Granted: 1974-09-10
•
Expires: 1993-06-29
Abstract
Abstract Filter for swimming pool water in which multiple operational modes including filtration, backwash and rinse modes are achieved with a valve structure affording positive sealing during operation, positive locking into mode, and adjustment between modes without frictionally wearing critical seals in the valve, and positive sealing at the waste discharge against air flow into the filter. The filter valve structure further employs large ports and direct flow passages to provide low pressure drop, even at very high flow rates through the filter, and a novel water distributor to avoid turbulence and undue disruption of the filter medium during filtration.
Inventors
- 👤 J Brett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; B01D24/14; B01D24/38; B01D24/40; B01D24/46; B01D24/4631; B01D24/4642; B01D2201/00; B01D2201/16; B01D2201/165; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86863
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
377 words
A swimming pool water filter comprising a vessel containing a water filtering medium and adapted for filtering water under pressure; a valve structure for controlling reverse water flow through the filtering medium, said valve structure comprising a hollow body having axially alined upper and lower sections; the upper section comprising a housing containing a plurality of circularly spaced ports defining respectively first and second inlet ports, an outlet port and a waste discharge port, and wall means defining an inlets port chamber, an outlet port chamber and a waste discharge port chamber separately within the housing; the lower section containing wall structure surrounding said ports defining water distribution means to the upper portion of the filter medium, and means forming a separate water passage within said wall structure axially of said lower section and thence radially outward to the valve periphery to deliver water to and from the lower portion of the filter medium; port seals below said ports; a rotatable valve plate having first and second circularly spaced valve openings arranged to selectively open and close said ports, said valve plate being shiftable axially normally into sealing engagement with said port seals responsive to vessel water pressure on said plate and selectively out of such engagement for rotational adjustment against said water pressure; valve operating means including a handle above the valve body, said valve handle being operable to downwardly axially shift and angularly oscillate said valve plate out of contact with said port seals among alternate positions includiNg a first position for filtration in which fluid flows from the first inlet port to the vessel interior through the water distribution means to the filter medium and reversely therefrom through the water passage means to said outlet while the second inlet port and the waste discharge port are closed by the valve plate, a second position for filter medium backwash communicating said first inlet port with said water passage means and the vessel interior with the waste discharge port, and a third position for filter medium rinse following backwash communicating the second inlet port with the vessel interior and the water passage means with the waste discharge port, and secondary valve means acting to block fluid flow through the waste discharge port into the vessel interior.
Claim 2
Dependent Claim
377 words
A swimming pool water filter comprising a vessel containing a water filtering medium and adapted for filtering water under pressure; a valve structure for controlling reverse water flow through the filtering medium, said valve structure comprising a hollow body having axially alined upper and lower sections; the upper section comprising a housing containing a plurality of circularly spaced ports defining respectively first and second inlet ports, an outlet port and a waste discharge port, and wall means defining an inlets port chamber, an outlet port chamber and a waste discharge port chamber separately within the housing; the lower section containing wall structure surrounding said ports defining water distribution means to the upper portion of the filter medium, and means forming a separate water passage within said wall structure axially of said lower section and thence radially outward to the valve periphery to deliver water to and from the lower portion of the filter medium; port seals below said ports; a rotatable valve plate having first and second circularly spaced valve openings arranged to selectively open and close said ports, said valve plate being shiftable axially normally into sealing engagement with said port seals responsive to vessel water pressure on said plate and selectively out of such engagement for rotational adjustment against said water pressure; valve operating means including a handle above the valve body, said valve handle being operable to downwardly axially shift and angularly oscillate said valve plate out of contact with said port seals among alternate positions includiNg a first position for filtration in which fluid flows from the first inlet port to the vessel interior through the water distribution means to the filter medium and reversely therefrom through the water passage means to said outlet while the second inlet port and the waste discharge port are closed by the valve plate, a second position for filter medium backwash communicating said first inlet port with said water passage means and the vessel interior with the waste discharge port, and a third position for filter medium rinse following backwash communicating the second inlet port with the vessel interior and the water passage means with the waste discharge port, and secondary valve means acting to block fluid flow through the waste discharge port into the vessel interior.
Claim 3
Dependent Claim
35 words
The filter according to claim 1 in which said water distribution means comprises an axially elongated perforate shell extending coaxially of and within the filter vessel spaced above the upper portion of the filter medium.
Claim 4
Dependent Claim
34 words
The filter according to claim 1 including also a pipe extending downwardly from said lower body section to the lower portion of the filter medium, and communicating with said water passage in the valve.
Claim 5
Dependent Claim
31 words
The filter according to claim 1, in which said valve has a circular chamber in open communication with the vessel interior and containing an essentially elbow configuration defining said water passage.
Claim 6
Dependent Claim
57 words
The filter according to claim 4, in which the elbow configuration depends from the valve plate and includes a downwardly open tubular boss, and including also a pipe extending upwardly from the lower portion of the filter medium for rotatably and slidably engaging said boss in fluid tight relation to define a continuation of said water passage.
Claim 7
Dependent Claim
36 words
The filter according to claim 5, in which said water distribution means comprises an axially elongated perforate shell coaxially with said pipe and having downward convergence to intersect said pipe in a plane below said boss.
Claim 8
Dependent Claim
30 words
The filter according to claim 6, including also median shoulder means within said shell and an annular water diffusion plate centered on said pipe and supported by said shoulder means.
Claim 9
Dependent Claim
52 words
The filter according to claim 7 in which said secondary valve means comprises a poppet valve having a valve head sized to overlie the waste discharge port and a valve stem, and including also a socket tube depending from the upper housing wall means slidably receiving the valve stem in guiding relation.
Claim 10
Dependent Claim
22 words
The filter according to claim 8 including also resilient seal means carried on the valve plate for sealing the waste discharge port.
Claim 11
Dependent Claim
52 words
The filter according to claim 1 in which said secondary valve means comprises a poppet valve having a valve head sized to overlie the waste discharge port and a valve stem, and including also a socket tube depending from the upper housing wall means slidably receiving the valve stem in guiding relation.
Claim 12
Dependent Claim
16 words
The filter according to claim 1, in which said ports lie in a common horizontal plane.
Claim 13
Dependent Claim
32 words
The filter according to claim 1, in which said vessel comprises wound glass fiber and resin impregnant and includes a valve structure mounting ring molded into the open top of said vessel.
Claim 14
Dependent Claim
104 words
The filter according to claim 1, including also means to couple inlet, outlet, and waste discharge lines into respective housing chambers including for each chamber, an exteriorly threaded projecting stub, a tubular adapter appropriately sized at opposite ends to abut the stub and fluid tightly interfit an incoming line, an external annular rib at the inner end of the adapter, an O-ring seal between the sleeve and said rib, and an interiorly threaded adapter nut having an inward flange engaging said rib and thread connected to said stub in adjustable relation to compress the O-ring and couple an incoming line into a housing chamber.
Claim 15
Dependent Claim
43 words
The filter according to claim 13, in which said lower section wall structure comprises a perforate shell having formed therein a multIplicity of individual orifices downwardly extending and variously radially directed outward toward the filter medium below to define said water distribution means.
Claim 16
Dependent Claim
102 words
The filter according to claim 1, including also means to couple inlet, outlet, and waste discharge lines into the housing at the inlet, outlet and waste discharge chambers respectively, said coupling means including vertically disposed openings through the upper section housing side wall and means to connect said lines thereinto, said inlet, outlet, and waste discharge ports lying in a common horizontal plane adjacently below their respective openings and offset from the vessel axis, said coupling means, openings and ports being sized relative to said lines to define an unreduced water flow path cross-section from said lines to said water distribution means.
Claim 17
Dependent Claim
32 words
The filter according to claim 15, in which said valve has a circular chamber in open communication with the vessel interior, and containing an essentially elbow configuration defining said water passage therewithin.
Claim 18
Dependent Claim
60 words
The filter according to claim 16, in which the elbow configuration depends from and moves with the valve plate, and includes a downwardly open tubular boss, and including also a pipe extending upwardly from the lower portion of the filter medium and rotatably and slidably engaging said boss in fluid tight relation to define a continuation of said water passages.
Claim 19
Dependent Claim
36 words
The filter according to claim 17, in which said water distribution means comprises an axially elongated perforate shell coaxial with said pipe and having downward convergence to intersect said pipe in a plane below said boss.
Claim 20
Dependent Claim
82 words
The filter according to claim 18, in which the valve operating means further includes a valve operating rod extending between the valve handle and the valve plate, a locking ring surrounding the rod and locking means carried by the rod for engaging the ring in locked positions corresponding to filter operation modes and passing the locking ring when the valve handle is depressed, and a spring centered on the operating rod adapted to bias the rod locking means upward into locked engagement.
Claim 21
Dependent Claim
52 words
The filter according to claim 19 in which said secondary valve means comprises a poppet valve having a valve head sized to overlie the waste discharge port and a valve stem, and including also a socket tube depending from the upper housing wall means slidably receiving the valve stem in guiding relation.
Claim 22
Dependent Claim
22 words
The filter according to claim 20 including also resilient seal means carried on the valve plate for sealing the waste discharge port.
References Cited (Backward Citations)
US3640310A
Cited
US3707233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |