GRACO 521079 - Regula Compression Spring, 400 to 1000 PSI (28 to 69 Bar; 2.8 to 7 MPa)

Low-range conversion spring that replaces the standard spring in regulator 903958 to enable lower regulated pressure operation, extending the useful pressure range from 400 to 1000 psi down to 28 to 69 bar (2.8 to 7 MPa)

Specifications

• Max Working Pressure: 400 to 1000 psi (28 to 69 bar; 2.8 to 7 MPa)
• Pressure Range: 400 to 1000 psi (28 to 69 bar; 2.8 to 7 MPa)
• Range: Low Range

Features

• Enables lower regulated pressure operation
• Extends pressure regulation range
• Direct replacement spring
• Precision pressure control in lower range

Applications

• Low-pressure regulation applications
• Precise pressure control requirements
• Applications requiring 400-1000 psi regulated pressure

Compatible Equipment

• 903958 - Stainless Spring Operated Mastic Fluid Pressure Regulator, 3/4 NPT - 3/4 in. npt(f) Regulator with Carbon Steel Body
• Model 903958 - Stainless Spring Operated Mastic Fluid Pressure Regulator, 3/4 NPT Series B Spring-Operated Regulator
• 903958 - Stainless Spring Operated Mastic Fluid Pressure Regulator, 3/4 NPT regulator

Related Parts

• 903958 - Stainless Spring Operated Mastic Fluid Pressure Regulator, 3/4 NPT
• 915587 - Diaphragm Housing
• 503141 - SPRING, high range (Model 903958 only)

Replaces spring in 903958 to allow regulated pressure from 400 to 1000 psi (28 to 69 bar; 2.8 to 7 MPa). Also related to part 915587 which is a Spring to Air Conversion Kit that converts 903958 from spring to air-operated regulator. Full specifications available on page 31. This is an optional low range spring for Model 903958. Replaces the original spring in the 903958 regulator when 400-1000 psi (2.8-7.0 MPa, 28-70 bar) regulated pressure range is required.

Reference Manuals

• 336833 (Page 131)
• 307517 (Page 2) Spring-Operated and Air-Operated, High Pressure Mastic Fluid Regulators