Samson 44-1B Pressure Reducing Valve / 44-6B Excess Valve

Samson 44-1B pressure reducing valve and 44-6B excess pressure valve

The Samson 44-1B is a self-operated pressure reducing valve for air, nitrogen, other gases, liquids and, in the 44-6B counterpart, steam. It shares one data sheet with the Type 44-6B excess pressure valve, because the two regulators use the same bellows actuator and body family and differ in what they do with the pressure signal. The 44-1B closes when the downstream pressure rises above the set point; the 44-6B opens when the upstream pressure rises above it. Both cover set points from 0.2 to 20 bar, threads G ½, G ¾ and G 1 and flanges DN 15 to DN 50, all at PN 25. Seven Star LLC supplies the Samson 44-1B in Oman and the GCC as an independent supplier based in Muscat.

Neither version needs auxiliary energy. A stainless steel operating bellows senses pressure directly, the spring-loaded single-seat valve moves the plug, and the low overall height makes the regulators easy to fit into crowded skids. Any mounting position is allowed, which sets the 44-1B apart from the steam-only 44-0B.

Decoding 44-1B and 44-6B

• 44 – Series 44 self-operated regulators with integrated bellows actuator.
• 1 – reducing function: controls the pressure downstream (outlet side) of the valve.
• 6 – excess pressure function: controls the pressure upstream (inlet side), acting as a back-pressure or relief regulator.
• B – bellows-actuated version.

Size, material and KVS are chosen from the ordering text rather than a suffix code, so state them in plain words in your enquiry.

Samson 44-1B technical specifications

KVS coefficients and seal materials for the 44-1B

The standard 44-1B has a balanced plug with a soft seal. Standard KVS values are 3.2 for G ½ and DN 15, 4.0 for G ¾, 5.0 for G 1 and DN 25, 16.0 for DN 40 and 20.0 for DN 50. Special unbalanced versions with KVS 0.25, 1.0 and 2.5 are listed, plus a metal-seated DN 40 type with KVS 8.0. For the 44-6B, the standard values are identical, with unbalanced special versions at 0.4 (metal seal), 1.0 and 2.5.

Seal choice sets the usable medium and temperature range:

How the 44-1B and 44-6B work

Medium flows in the direction of the arrow cast on the body. In the 44-1B the controlled pressure is picked up inside the body through a borehole and acts on the operating bellows. At pressures below the set point the valve is open; as the downstream pressure rises above the set point, the bellows overcomes the spring and drives the plug toward the seat. The 44-6B is closed when depressurised and opens as soon as the upstream pressure exceeds the set point, which makes it a compact way to hold back-pressure or to vent a surplus.

The set point is changed with a handwheel on the standard version. For the 8 to 20 bar range, and for stainless steel or ductile iron bodies in DN 40 and 50, a hexagon socket screw replaces the handwheel.

Special versions available for the 44-1B

• Internal parts in FKM, for use with mineral oils
• Ductile iron body with wetted parts free of non-ferrous metal
• PTFE-free version
• Version for flammable gases on request
• Pressure gauge or control line preparation with a G 1/8 connection
• FDA version for use close to the product; maximum temperature 60 °C, not for direct product contact
• Electric or pneumatic set point adjustment up to G 1 or DN 25; electric for set points up to 10 bar
• Differential pressure regulator up to G 1 or DN 25

Where the 44-1B fits and related parts

The 44-1B pairs naturally with the 44-6B on gas systems: reduce with one, relieve or hold back-pressure with the other. For steam-only reduction the 44-0B is the better match. Type 44-2 is the diaphragm-actuated option for liquids and district heating, and Type 2406 is a larger excess pressure valve for low-pressure gas blanketing. For service, keep the type, size, KVS and set point range from the nameplate to hand when asking for spare parts.

Selection and ordering checklist for the 44-1B

• Decide between reducing (44-1B) and excess pressure (44-6B) function before anything else.
• Medium, temperature and cleanliness; this selects body and seal material.
• Inlet pressure, outlet set point and flow, to choose the KVS and check the differential pressure limit.
• Connection type and size, and mating flange standard.
• Soft seal versus metal seal, based on leakage requirement and wear.
• Any special version, including FDA, FKM or PTFE-free internals.

Installation and maintenance of the 44-1B

Match the flow direction to the arrow on the body. The 44-1B can be mounted in any position, but leave room for the handwheel and the actuator housing. A strainer upstream protects the soft seat from weld spatter and scale, which are the usual causes of seat damage in new pipework. Commission by opening the isolating valves slowly and adjusting the set point against a gauge.

The regulators are low-maintenance. During shutdowns inspect the bellows for corrosion or fatigue, replace worn seat or plug seals, and check that the set point holds. Keep a seal kit available for spares on critical gas or air stations.

Typical applications in Oman and the GCC

Typical Gulf uses include instrument air and nitrogen skids in gas plants, compressed air lines in workshops and utilities, lube and seal oil supply stations, water make-up lines and gas supply headers to burners. In hot, dusty coastal sites the stainless steel body and enclosed bellows are a robust option, and the any-position mounting simplifies retrofits where there is little space.

Information to send with an RFQ for the 44-1B

• Reducing (44-1B) or excess pressure (44-6B) function
• Medium, temperature, flow and pressures (inlet and set point)
• Connection type, size and flange standard
• Body and seal material, special version if any
• Project tag number and delivery location

Documents and quotation

A Samson datasheet covering the Type 44-1B and Type 44-6B is attached on this page, including KVS tables, materials and dimensions.

Send your duty data and Seven Star LLC will quote the 44-1B or the 44-6B for delivery in Oman and the GCC.