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Type 77 Vacuum

Type 77 Vacuum Regulator

Single-unit control of pressures from 29" Hg vacuum to 150 psi
Flow capacity up to 40 SCFM
Dampening action of aspirator tube maintains stable output pressure
Output virtually unaffected by changes in supply pressure
Can be disassembled and serviced without removing from line

Product Detail:

Bellofram’s Type 77 Vacuum Regulator incorporates a fixed negative 15 psig bias spring to maintain vacuum outputs up to 29" Hg. An adjustable opposing range spring increases controlled pressure outputs up to 150 psig. Output pressure droop under varying downstream flow conditions is minimized by use of an aspirator tube which adjusts the air supply valve opening in accordance with flow velocity. A balanced supply valve, utilizing a reinforced rolling diaphragm, keeps regulator output virtually immune to changes in supply pressure. Stack-up construction makes the Type 77 easily serviceable, without removing it from the air line.

The Type 77 provides precise control in subatmospheric pressure applications. Specific uses include sample collecting systems, air quality monitoring, parts coating operations, and other industrial functions requiring controlled system pressure from 29" Hg vacuum to 150 psig. The regulator may be installed either upstream or downstream from the vacuum pump. Upstream installation is preferred when rapid evacuation of a vessel or system is required, because the exhaust capacity of the pump is normally greater than that of the regulator. In all other applications, the regulator can be located between the pump and the vessel.

Part Numbers:

Type 77	Range		Part Number
Type 77	BAR	psig	1/4" NPT Port	3/8" NPT Port
Vac. to	0.1	2	960-500-000	960-505-000
Vac. to	0.7	10	960-501-000	960-506-000
Vac. to	2.1	30	960-502-000	960-507-000
Vac. to	6.9	100	960-503-000	960-508-000
Vac. to	10.3	150	960-504-000	960-509-000
To order BSPT threads （including Gauge Port） add "BSPT" to end of part number.

Options:

Replace the last three digits of the part number with digits from the table below. If more than 2 combination needed, Consult Factory.
OPTION		5	7	8
5	Epoxy Coating	005	075	085
7	Mounting Bracket		007	087
8	Pressure Gauge			008

Corrosive Resistant Epoxy Finish: An epoxy paint applied to the body and bonnet of the regulator exterior surfaces to provide increased corrosion resistance.
Mounting Bracket: Steel （dichromate finish） bracket for side mounting.
Pressure Gauge: Dual scale 2.5 in. （63 mm） gauges. Ranges include 30" Hg – 15 psig （-100 to 100 kPa）, 30" Hg – 60 psig （-100 to 400 kPa）, and 30" Hg – 150 psig （-100 to 1100 kPa）. When specified with regulator, the correct range will be supplied. For NPT versions only.