The invention is a gas vent valve (10) for a gas pressure regulator (1), comprising: a tubular body (11) developed between two opposite openings (11a, 11b); a shutter body (12) biased towards a position in which a first opening (11a) of the tubular body (11) is closed and movable from the closed position towards an open position for opening the first opening (11a) due to the effect of a pressure acting from the outside of the tubular body (11) through the first opening (11a); constraining means (13) configured so as to prevent the movement of the shutter body (12) from the closed position towards the open position when the ambient temperature exceeds a predefined value.

Embodiments of the present disclosure are directed toward a pressure vacuum relief valve and a seal assembly of the pressure vacuum relief valve. The seal assembly includes a ribbed substrate disposed against a flanged seat of the pressure vacuum relief valve. The ribbed substrate includes ribs extending from a base of the ribbed substrate. The seal assembly also includes a pallet coupled to and disposed below the ribbed substrate. The pallet includes a top ring, a bottom ring, and a flexible diaphragm captured between the top ring and the bottom ring. The flexible diaphragm of the pallet is configured to seal against the ribbed substrate in a sealed position. The pallet and ribbed substrate are configured to move together away from the flanged seat when a pressure on a sealed side of the pressure vacuum relief valve exceeds a maximum pressure threshold. The pallet is also configured to pivot open at an angle relative to the sealed position of the pallet when the pressure on the sealed side of the pressure vacuum relief valve falls below a minimum pressure threshold.

Embodiments of the present disclosure are directed toward a pressure vacuum relief valve and a seal assembly of the pressure vacuum relief valve. The seal assembly includes a ribbed substrate disposed against a flanged seat of the pressure vacuum relief valve. The ribbed substrate includes ribs extending from a base of the ribbed substrate. The seal assembly also includes a pallet coupled to and disposed below the ribbed substrate. The pallet includes a top ring, a bottom ring, and a flexible diaphragm captured between the top ring and the bottom ring. The flexible diaphragm of the pallet is configured to seal against the ribbed substrate in a sealed position. The pallet and ribbed substrate are configured to move together away from the flanged seat when a pressure on a sealed side of the pressure vacuum relief valve exceeds a maximum pressure threshold. The pallet is also configured to pivot open at an angle relative to the sealed position of the pallet when the pressure on the sealed side of the pressure vacuum relief valve falls below a minimum pressure threshold.

A heatable canteen includes a hand held vessel having a bottom and upward extending wall which terminates into a top having an open top receiving surface, a removable cap connected to said top receiving surface, the removable cap having an outer portion which removably sealably connects to the top receiving surface and has an interior channel extending therethrough and has a valve seat in a lower end thereof and a valve ball installed in a manner to bias the valve ball against the valve seat to a normally closed position. A secondary vessel is provided about the hand held vessel. A lid is connected to the vessel or cap by way go a heatable line. A distillation tube removably connects to the vessel.

A hydrostatic tank floor relief valve of a construction described herein provides for equalization of hydrostatic pressure of fluid in a storage tank with hydrostatic pressure of ground water surrounding the storage tank. A high efficiency grate located in a flow channel of the hydrostatic tank floor relief valve blocks debris from entering the storage tank during pressure equalization, yet does not reduce effective flow rates through a flow channel of a given diameter. The hydrostatic tank floor relief valve optionally includes an elastomeric seal surface and a stainless steel seat ring that reduce the likelihood of particulate matter disrupting valve operation, and provide a more reliable seal.

A hydrostatic tank floor relief valve of a construction described herein provides for equalization of hydrostatic pressure of fluid in a storage tank with hydrostatic pressure of ground water surrounding the storage tank. A high efficiency grate located in a flow channel of the hydrostatic tank floor relief valve blocks debris from entering the storage tank during pressure equalization, yet does not reduce effective flow rates through a flow channel of a given diameter. The hydrostatic tank floor relief valve optionally includes an elastomeric seal surface and a stainless steel seat ring that reduce the likelihood of particulate matter disrupting valve operation, and provide a more reliable seal.

A regulator for establishing outlet fluid pressure. The regulator includes a valve body having a fluid pressure inlet in selective fluid communication with a fluid pressure outlet. A pilot pressure inlet is formed in the valve body and in fluid communication with a source of pilot pressure. Valving structure in the valve body establishes outlet fluid pressure as a function of pilot pressure. First adjustable structure within the valve body may establish a minimum outlet fluid pressure threshold without regard to pilot pressure. Second adjustable structure within the valve body may establish outlet fluid pressure offset relative to pilot pressure.

A regulator for establishing outlet fluid pressure. The regulator includes a valve body having a fluid pressure inlet in selective fluid communication with a fluid pressure outlet. A pilot pressure inlet is formed in the valve body and in fluid communication with a source of pilot pressure. Valving structure in the valve body establishes outlet fluid pressure as a function of pilot pressure. First adjustable structure within the valve body may establish a minimum outlet fluid pressure threshold without regard to pilot pressure. Second adjustable structure within the valve body may establish outlet fluid pressure offset relative to pilot pressure.

Embodiments of a flow control apparatus of the present invention generally include a vessel equipped with a substantially vertical, bottom-feeding liquid inlet line, a vapor space pressure equalization line, and a liquid outlet, wherein the vessel contains a pair of connected, horizontally oriented, O-ring and/or piston ring equipped sealing plates that are designed to rise and fall as a pair in response to gravity provided liquid pressure in the sump of the vessel, whereby an elevation of the sealing plates provides the liquid in fluid communication with the liquid outlet via internal orifices fluidly connected to one or more fluid conduits. Embodiments of a method of using embodiments of an apparatus of the present invention to control liquid flow are also provided.

Embodiments of a flow control apparatus of the present invention generally include a vessel equipped with a substantially vertical, bottom-feeding liquid inlet line, a vapor space pressure equalization line, and a liquid outlet, wherein the vessel contains a pair of connected, horizontally oriented, O-ring and/or piston ring equipped sealing plates that are designed to rise and fall as a pair in response to gravity provided liquid pressure in the sump of the vessel, whereby an elevation of the sealing plates provides the liquid in fluid communication with the liquid outlet via internal orifices fluidly connected to one or more fluid conduits. Embodiments of a method of using embodiments of an apparatus of the present invention to control liquid flow are also provided.