HOKE Packless Valves Distributor in India

Priminox Overseas is an official distributor and supplier of HOKE Packless Valves in India. HOKE Packless Valves seal the process fluid from atmosphere with a metal bellows or diaphragm in place of stem packing, removing the leak path and packing-wear failure mode of conventional valves. We stock the 0300, 4100, 4200, 4500, and 4600 Series bellows and diaphragm valves, along with the DV1 Series 2-way diaphragm valve from our Mumbai warehouse. Body materials cover 316 stainless steel, brass, MONEL, and HASTELLOY C-276, and operating pressures run from vacuum up to 3,600 psig (248 bar) on the DV1 large pneumatic actuator.

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Explore the Full Series of HOKE Packless Valves

The range covers six series across two construction families: the 0300 Series air operated bellows valves, the 4100, 4200, and 4500 Series bellows sealed valves, the 4600 Series gasketed and welded diaphragm valves, and the DV1 Series 2-way diaphragm valves. Base or panel mounting is available across the range.

HOKE 0300 Series Air Operated Bellows Valves

Design Type: Air operated bellows valve, supplied as normally closed (0361) or normally open (0371) with the same air entry position.
Body Material: 316 stainless steel.
Orifice Size: 0.170" (4.32 mm).
Cv Factor: 0.28.
Internal Volume: 0.08 cubic inches.
Pressure Rating: vacuum to 200 psig on the 0361 (NC); vacuum to 350 psig on the 0371 (NO).
Temperature Range: -40°F to +250°F (-40°C to +121°C).
Helium Leak Test: envelope 0.0005 MCFH (5.2 × 10^-9 SCC/SEC); seat 0.001 MCFH (1.04 × 10^-8 SCC/SEC).
Seat Material: PCTFE.
End Connections: 1/4" GYROLOK and 1/4" female NPT.
Applications: High purity and hazardous gas distribution systems, diffusion furnaces, epitaxial reactors, gas panels, purge systems, and gas cabinets.

HOKE 4100 Series Bellows Sealed Valves

Design Type: Bellows sealed valve, with seal-welded bellows on 316 stainless steel bodies and phosphor bronze bellows silver-soldered to body and stem on brass bodies.
Body Materials: 316 stainless steel and brass.
Orifice Sizes: vee stem 0.059" (1.5 mm) on 316 SS and 0.060" (1.5 mm) on brass; blunt stem 0.170" (4.3 mm); PCTFE stem 0.170" (4.3 mm) on brass.
Cv Factor: 0.35 maximum (blunt stem); 0.059 (vee stem).
Internal Volume: 0.08 cubic inches.
Pressure Rating: vacuum to 1,000 psig (70 kg/cm²) on 316 stainless steel; vacuum to 600 psig at 70°F (45 kg/cm² at 21°C) on brass.
Temperature Range: -40°F to +600°F (-40°C to +316°C) on 316 stainless steel; -40°F to +300°F (hard seat) and -40°F to +250°F (soft seat) on brass.
Stem Options: blunt, vee, or PCTFE.
End Connections: 1/4" NPT male, 1/4" and 6 mm GYROLOK on 316 stainless steel; 1/8" NPT male, 1/4" NPT male, and 1/4" GYROLOK on brass.
Panel Mounting: kit 4100K1.
Applications (316 stainless steel): Critical gas analysis, high temperature liquid metals, handling reactive and toxic fluids, and vacuum system bake-out.
Applications (Brass): Sampling systems, gas analysis equipment, laboratory service, and instrumentation.

HOKE 4200 Series Bellows Sealed Valves

Design Type: Bar stock, all-welded bellows sealed valve with non-rising stem and positive plug return.
Body Material: 316 stainless steel.
Orifice Size: 0.156" (3.962 mm).
Cv Factor: 0.36 maximum.
Internal Volume: 0.18 cubic inches.
Pressure Rating: hard seats 2,000 psi at 600°F (141 kg/cm² at 316°C); soft seats 500 psi at 350°F (35 kg/cm² at 175°C).
Vacuum Rating: to 10^-5 Torr.
Temperature Range: -320°F to +1200°F (-195°C to +632°C).
Other Features: Hex guide mates with hex broach in bonnet so no torque transmits to the bellows; secondary o-ring seal in upper bonnet; replaceable plugs and bellows on gasketed types.
End Connections: 1/4" NPT female, 1/4" GYROLOK, 3/8" O.D. socket weld, and 3" tube extensions with socket weld to body.
Mounting: base or panel mounted (add prefix "D" to the part number for panel mounted).
Applications: Critical gas analysis, high temperature liquid metals, cryogenics, reactive and toxic fluids, sealing cesium or isotope containers, and high vacuum systems.

HOKE 4500 Series Miniature Bellows Sealed Valves

Design Type: Miniature bellows sealed valve with one-piece bellows and stem assembly.
Body Materials: Brass and MONEL.
Orifice Size: 0.156" (model 4551Q6M uses 0.281").
Cv Factor: 0.70 maximum (0.21 on standard 4551 models).
Internal Volume: 0.08 cubic inches.
Pressure Rating: 10^-5 Torr to 300 psig.
Temperature Range: -20°F to +250°F (-29°C to +120°C).
Other Features: Protective handle limits process fluid escape if the bellows ruptures; PCTFE seat fully encapsulated to prevent cold flow; air-to-open or air-to-close operators available for remote actuation.
End Connections: 1/8" NPT female and 1/4" O.D. tube extensions in straight, angle, and tee patterns.
Applications: Stop valve in calibrated leak testers, high vacuum work, and laboratory environments demanding leak-tight service.

HOKE 4600 Series Gasketed and Welded Diaphragm Valves

Design Type: Diaphragm valve in gasketed and welded versions, available in straight or angle flow patterns.
Body Material: MONEL.
Diaphragm Material: INCONEL.
Orifice Size: 0.125" (3.2 mm).
Cv Factor: 0.2.
Internal Volume: 0.11 cubic inches.
Pressure Rating (Gasketed): 300 psig at 70°F (2.07 MPa at 21°C).
Pressure Rating (Welded): vacuum to 300 psig at 70°F.
Vacuum Rating (Gasketed): 10^-5 Torr.
Temperature Range (Gasketed): -65°F to +240°F (-54°C to +116°C).
Temperature Range (Welded): -65°F to +600°F (-54°C to +316°C); welded models suit bake-out service with the plastic handle cap removed.
Helium Leak Test (Gasketed): envelope 5 × 10^-9 SCC/SEC; seat 1 × 10^-8 SCC/SEC.
Helium Leak Test (Welded): seat 5 × 10^-9 SCC/SEC.
Other Features: Square drive on the gasketed handle permits reach rod operation for remote areas; easy diaphragm assembly replacement on the gasketed model.
End Connections: 1/4" tube extensions (gasketed straight 4613N4M and angle 4623N4M); 1/4" socket weld tube extensions (welded straight 4618N4M and angle 4628N4M).
Applications: High temperature bake-out, high vacuum, instrumentation, research labs, gas analysis, and corrosive fluids.

HOKE DV1 Series 2-Way Diaphragm Valves

Design Type: 2-way on/off diaphragm valve, manual 1/4-plus turn or pneumatic actuation, with metal-to-metal seals to atmosphere and no springs, bellows, packing, o-rings, or lubricants in the wetted flow path.
Body Materials: 316L stainless steel, MONEL, and HASTELLOY C-276.
Diaphragm Material: Elgiloy AMS 5876.
Seat Materials: PCTFE and PEEK.
Orifice Size: 0.110" (2.8 mm).
Flow Capacity: 0.17 Cv.
Internal Volume: 0.16 cc (in the machined passages between mounting surface and sealing diaphragm).
Pressure Rating: vacuum (50 torr) to 3,600 psig (248 bar); valves cleaned for oxygen service are limited to 3,000 psig (207 bar).
Proof Pressure: 7,200 psig.
Burst Pressure: 14,400 psig (497 barg).
Temperature Range: -40°F to +212°F (-40°C to +100°C) with PCTFE seat; -40°F to +400°F (-40°C to +204°C) with PEEK seat.
Leakage: 1 × 10^-9 cc/sec helium (inboard).
Actuation Options: Manual 1/4-plus turn round handle or T-handle; pneumatic small actuator (vacuum to 500 psig), medium (vacuum to 800 psig), or large (vacuum to 3,600 psig); 40µ sintered 316 stainless steel air inlet filter on pneumatic actuators.
End Connections: GYROLOK 1/16", 1/8", 1/4", 6 mm, and 8 mm; 1/4" male and female NPT; 1/4" male and female BSP/ISO 7/1; 1/4" extended NPT; 1/4" VCR-compatible swivel female and fixed male; 1/4" tube stub and socket weld; surface mount (ANSI/ISA SP76 compliant).
Applications: Analytical instrumentation, petrochemical, pharmaceutical, and chemical.

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Share your HOKE Packless Valve part number or send the service media, pressure, and temperature, and we will confirm the right 0300, 4100, 4200, 4500, 4600, or DV1 model with stock position and price.

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Industries We Supply HOKE Packless Valves

HOKE Packless Valves deliver leak-tight sealing for gas analysis, sampling, high vacuum, and hazardous media service across the following industries:

Oil and Gas

Petrochemicals

Refining

Chemical Processing

Power Generation

Semiconductor

Pharmaceutical

Hydrogen Industry

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HOKE Packless Valves: Sourcing and Technical Questions

A HOKE Packless Valve seals the process fluid from atmosphere with a metal bellows or diaphragm instead of stem packing, removing the leak path that packed valves develop as packing wears. The construction suits gas analysis, hazardous media, high vacuum, and high purity service where fugitive emissions and atmospheric ingress are unacceptable.

The maximum operating pressure of HOKE Packless Valves is 3,600 psig (248 bar) on the DV1 Series with the large pneumatic actuator. The 4200 Series carries 2,000 psi at 600°F on hard seats, the 4100 Series reaches 1,000 psig in 316 stainless steel and 600 psig in brass, the 4500 and 4600 reach 300 psig, and the 0300 Series runs 200 psig on the 0361 (NC) or 350 psig on the 0371 (NO).

The operating temperature range is -320°F to +1200°F (-195°C to +632°C) on the 4200 Series at the widest end. The 4100 Series 316 stainless steel and 4600 welded both reach +600°F, the DV1 with PEEK seat reaches +400°F, the 4100 brass holds -40°F to +300°F on hard seats, the 0300 holds -40°F to +250°F, and the 4500 holds -20°F to +250°F.

The body materials available are 316 stainless steel, 316L stainless steel, brass, MONEL, and HASTELLOY C-276. The 0300 and 4200 are 316 stainless steel only, the 4100 covers 316 stainless steel and brass, the 4500 covers brass and MONEL, the 4600 is MONEL, and the DV1 covers 316L stainless steel, MONEL, and HASTELLOY C-276.

The difference is that the bellows series (0300, 4100, 4200, 4500) seal the stem with a metal bellows welded or silver-soldered into the body, while the diaphragm series (4600 and DV1) seal with a flexing metal diaphragm clamped between body and bonnet. The 4200 bellows valve handles the widest temperature window (-320°F to +1200°F) and the DV1 diaphragm valve handles the highest pressure (3,600 psig) and the lowest internal volume (0.16 cc).

Yes, the 4200 Series handles cryogenic service down to -320°F (-195°C) and high vacuum to 10^-5 Torr. The 4500 Series and the gasketed 4600 also reach 10^-5 Torr vacuum, and the DV1 Series operates from 50 torr vacuum upward.

Explore Other HOKE Products from Priminox Overseas

Beyond instrumentation valves, Priminox stocks the complete HOKE product family — fittings, actuators, quick couplings and sampling solutions.

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