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Bellows pressure relief valve

A bellows and valve seat technology, applied in the field of reciprocating pumps, can solve problems such as deformation, air intake, and bellows not allowed

Active Publication Date: 2018-08-03
GRACO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the backup seal seals the back of the bellows and does not allow the bellows to vent as the bellows expand and contract, which causes cyclic fatigue and deformation of the bellows
If a simple vent with a screen or mesh is placed between the bellows and the back-up seal, the volume of working fluid expelled may be reduced, but air will be drawn in and the pump will not operate in the event of a bellows rupture. continue to run

Method used

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  • Bellows pressure relief valve
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Pump( figure 1 and figure 2 )

[0023] figure 1 and figure 2 is a cross-sectional view of the reciprocating pump 10 . will discuss figure 1 and figure 2 .

[0024] Reciprocating pump 10 includes housing 12, upper end 13 of housing 12 having bellows chamber 14, lower end 15 of housing 12 having displacement chamber 16, cylinder manifold 17, piston 18, throat seal 19, outlet 20A and 20B, inlets 22A and 22B, conduit 24, stem 26 with shoulder 28 and neck 29, sleeve 30, outer portion 32 of sleeve 30, collar 34, bellows with inner portion 38 and convoluted portion 40 36, nut 42, bearing 44, end cap 46 with opening 48 and passage 50, bearing 54, seal 56 and relief valve 58. figure 1 Flow F through the reciprocating pump 10 is also included.

[0025] Reciprocating pump 10 includes a bellows circulation pump configured to pump paint and / or other fluids. Although paint will be used as an example in this disclosure, it should be understood that this is only one exampl...

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PUM

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Abstract

A valve for a reciprocating pump includes a housing, a first chamber, a second chamber, a first valve element, and a second valve element. The housing includes an inlet and an outlet. The first and second chambers are within the housing. The first chamber includes a first valve seat and is fluidly connected to the inlet. The second chamber includes a second valve seat and is fluidly connected to the outlet. The first valve element is disposed in the first chamber and includes a spring-loaded check valve element. The second valve element is disposed in the second chamber and includes a buoyantmaterial.

Description

[0001] Cross reference to related applications [0002] This application claims priority to US Provisional Application No. 62 / 269,436, filed December 18, 2015, entitled "BELOWS RELIEF VALVE," the entire contents of which are incorporated herein by reference. Background technique [0003] The present disclosure relates to reciprocating pumps, and more particularly to reciprocating pumps having bellows seals. [0004] In reciprocating pumps, bellows are used to form a non-slip seal to prevent exposure of the working fluid to the outside air. To prevent unwanted fluid leakage, backup seals are employed to seal the shaft surrounded by bellows. However, the backup seal seals the back of the bellows and does not allow the bellows to vent as the bellows expand and contract, which causes cyclic fatigue and deformation of the bellows. If a simple vent with a screen or mesh is placed between the bellows and the backup seal, the volume of working fluid expelled may be reduced, but air ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/10F16K31/44F04B53/14
CPCF04B53/143F16K15/044F16K24/046F04B53/1002F04B43/084F04B45/02F04B53/10F04B53/125F04B53/14F16K31/44F04B53/1005F04B19/22F04B39/047F16K17/0406F16K17/048
Inventor 蒂姆西·S·罗曼
Owner GRACO INC