Technical Datasheet -- 3-Valve Instrument Manifold -- Equalising SS316

3-Valve Instrument Manifold -- Equalising SS316

Direct-Mount 3-Valve Manifold with Block and Equalise for DP Transmitters

Document No.SV-DS-MNF-002

RevisionRev A

DateMay 2026

ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India

This datasheet covers 3-valve instrument manifolds machined from solid SS316 barstock with two block valves and one centre equalising valve for direct mounting to differential pressure transmitters and gauges.

Parameter	Specification
Size Range	1/2" NPT process x 1/2" NPT instrument (standard)
Pressure Rating	6,000 PSI (standard), 10,000 PSI (high-pressure option)
Body Material	Solid SS316 barstock, one-piece machined
Valve Configuration	Two block valves + one centre equalising valve
Needle Tip	SS316 non-rotating Vee-point tip on all three valves
Seat Material	Integral SS316, matched-lapped
Temperature Range	-73°C to +538°C (graphite packing)
Connections	1/2" NPT male/female process; 1/2" NPT female instrument
Mounting	Direct mount 54 mm centre-to-centre for most DP transmitters
Handle	SS304 knurled handwheel standard; T-bar and colour-coded optional
Features	Two block + equalise, non-rotating tip, blow-out proof stem, direct mount

Parameter

Specification

Size Range

1/2" NPT process x 1/2" NPT instrument (standard)

Pressure Rating

6,000 PSI (standard), 10,000 PSI (high-pressure option)

Body Material

Solid SS316 barstock, one-piece machined

Valve Configuration

Two block valves + one centre equalising valve

Needle Tip

SS316 non-rotating Vee-point tip on all three valves

Seat Material

Integral SS316, matched-lapped

Temperature Range

-73°C to +538°C (graphite packing)

Connections

1/2" NPT male/female process; 1/2" NPT female instrument

Mounting

Direct mount 54 mm centre-to-centre for most DP transmitters

Handle

SS304 knurled handwheel standard; T-bar and colour-coded optional

Features

Two block + equalise, non-rotating tip, blow-out proof stem, direct mount

Component	Material
Body	SS316 solid barstock, one-piece machined with three integral valve chambers
Needle	SS316 hardened non-rotating Vee-point tip on all three valves, matched-lapped to seat
Stem	SS316 anti-blow-out stem with ACME threads on all three valves
Packing	PTFE V-rings (standard) or graphite braided (high temperature)
Gland Nut	SS316 hex gland nut with smooth threads to prevent galling
Bonnet	SS316 threaded or union bonnet for in-line packing replacement
Handle	SS304 knurled handwheel; optional colour-coded handles for block vs equalise identification

Component

Material

Body

SS316 solid barstock, one-piece machined with three integral valve chambers

Needle

SS316 hardened non-rotating Vee-point tip on all three valves, matched-lapped to seat

Stem

SS316 anti-blow-out stem with ACME threads on all three valves

Packing

PTFE V-rings (standard) or graphite braided (high temperature)

Gland Nut

SS316 hex gland nut with smooth threads to prevent galling

Bonnet

SS316 threaded or union bonnet for in-line packing replacement

Handle

SS304 knurled handwheel; optional colour-coded handles for block vs equalise identification

Test	Requirement
Test Standard	Hydrostatic 1.5x rated pressure per API 598 / MSS SP-99
Certification	CE, ISO 9001, NACE MR0175 on request

Test

Requirement

Test Standard

Hydrostatic 1.5x rated pressure per API 598 / MSS SP-99

Certification

CE, ISO 9001, NACE MR0175 on request

Standard	Description
Design Standard	ASME B16.34 / MSS SP-99

Standard

Description

Design Standard

ASME B16.34 / MSS SP-99

Notes

Always open equalising valve before closing both block valves to prevent over-ranging or damaging the transmitter differential element.
Standard centre-to-centre is 54 mm; confirm transmitter mounting pattern before ordering, as 57 mm and 64 mm variants exist.
For high-vibration compressor or pump discharge service, specify locking handles and anti-vibration transmitter mounting bracket.
NACE MR0175 compliant version available for sour gas; specify if H2S partial pressure exceeds 0.01 MPa.
Manifold must be depressurised through bleed connection before removing transmitter; follow lock-out tag-out procedures.