Design

PSN cast steel globe valve has been designed to conform to BS1873 and ASME B16.34.
Wall thickness dimensions comply with API 600.
Face to face, end to end and center to face dimensions of flanged and butt welded valves are in accordance with ASME B16.10,
BS 2080 and ISO 5752.
End flange dimension conform to ASME B16.25.
BW end dimension conform to ASME B16.25.
Inspection and test are in accordance with API 598 and BSE EN 12266.

Body and Bonnet
Castings are precisely machined.
The gasket contacting surface is smooth finish that has a roughness between Rs.3.2 and 6.3 micrometer (125-250microinch).
The surface roughness of gasket grooves of ring joint faces do not exceed 63 micro inch.
Body seat construction of PSN Cast steel valve is threaded seat ring.
Provided with bosses for optional by-passes or drains.

Stem
Stem with precision Acme threads and burnished finish.
16 to 32 RMS stem surface finish.straightness and roundness are precisely controlled according to PSN design and manufacturing standards.

Stuffing Box
Maximum 125 RMS surface finish. Cylindricity and Verticality are precisely controlled according to PSN design and manufacturing standards.
Optional lantern rings and grease injectors are available.

Gland and Packing
Gland has a two-piece construction for easy alignment.
Middle rings dieformed 100% laminated flexible graphite rings, top and bottom rings lattice braided graphite fiber with corrosion inhibitor.

Bonnet Gasket
Class 150 ~ 600: Jacketed graphite with stainless steel or spiral wound graphite with stainless steel.
Class 900 and over: Ring joint metal gasket.

Bonnet Bolting
Coarse thread series for bolt sizes 1 inch and smaller, 8-thread series for bolt sizes 11/8 inch and larger, both conform to Class 2A/2B tolerances.

Operators
Globe valves normally are handwheel operation, but are also available with gear, electric motor actuators, or cylinder actuators for remote operation.