# US 4,396,505 A · Filtration system pump arrangement

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- Number: US 4,396,505 A
- Document ID: US4396505A
- Status: Granted
- Kind: A
- Application number: 06/329,178
- Filed: 1981-12-10
- Granted: 1983-08-02
- Earliest claimed: 1981-12-10
- Assignees: AMSTED Industries Incorporated
- Inventors: David H. Willson; Thomas C. Adams
- Web page: https://patentgrep.com/patent/US4396505A

## CPC

- B01D 29/09: with filtering bands, e.g. movable between filtering operations
- B01D 29/605: {by level measuring}
- B01D 29/606: {by pressure measuring}
- B01D 29/92: for discharging filtrate
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A filtering device including a tank partially located below floor level having a filtrate compartment and a filter means interposed therebetween. Reservoir means and an end suction centrifugal pump means both located substantially on floor level wherein conduit means selectively permits the filtrate level in the reservoir to maintain a positive pressure at the inlet of the pump when pump is shut off, and to neutralize the pressure differential between the filtrate compartment and the tank.

## Claims

### Claim 1

A filtering device for separating suspended particles from a liquid suspension including a tank partially located below floor level, a filtrate compartment contiguous to said tank located below said floor level, separating means including a filter means interposed between said tank and said filtrate compartment to separate suspended particles from said liquid suspension, reservoir means for holding a volume of said liquid filtrate received from said filtrate compartment, and having inlet and discharge conduits connected thereto, pump means located substantially on the same level as said floor level above said filtrate chamber, a conduit means having one of its ends connected to said filtrate chamber and other end thereof communicating with said reservoir discharge conduit and inlet of said pump means, and normally closed flow control means in said conduit for directing flow of filtrate when open from said reservoir toward said pump means, whereby said liquid filtrate in said reservoir means provides a positive liquid pressure at said inlet of said pump means so as to prime said pump means in a start-up operation.

### Claim 2 (depends on 1)

The filtering device as described in claim 1 wherein said flow control means comprises valve means disposed in said discharge conduit means so that closing said valve means in said discharge conduit permits liquid filtrate to flow from said filtrate compartment to said operating pump means.