An exhaust valve includes a stem extending to a valve end. The valve end includes a pressure relief apparatus. An engine assembly includes a casing defining a cylinder bore, a combustion chamber and an exhaust passage. The combustion chamber is disposed between the exhaust passage and the cylinder bore. The engine assembly also includes a piston movable in the cylinder bore. The engine assembly further includes an exhaust valve movable between a first position blocking fluid communication through the exhaust passage and a second position allowing fluid communication through the exhaust passage. The exhaust valve includes a pressure relief apparatus configured to allow fluid communication through the exhaust valve from the cylinder bore to the exhaust passage when the exhaust valve is in the first position and a predetermined pressure threshold occurs in the cylinder bore between the exhaust valve and the piston.

An exhaust valve includes a stem extending to a valve end. The valve end includes a pressure relief apparatus. An engine assembly includes a casing defining a cylinder bore, a combustion chamber and an exhaust passage. The combustion chamber is disposed between the exhaust passage and the cylinder bore. The engine assembly also includes a piston movable in the cylinder bore. The engine assembly further includes an exhaust valve movable between a first position blocking fluid communication through the exhaust passage and a second position allowing fluid communication through the exhaust passage. The exhaust valve includes a pressure relief apparatus configured to allow fluid communication through the exhaust valve from the cylinder bore to the exhaust passage when the exhaust valve is in the first position and a predetermined pressure threshold occurs in the cylinder bore between the exhaust valve and the piston.

An assembly includes a first enclosed flexible pressure chamber. A first extension arm extends from a first endwall of the first enclosed flexible pressure chamber. A second enclosed flexible pressure chamber includes a second extension arm extending from a second endwall of the second enclosed flexible pressure chamber. A lever arm is disposed on a pivot. A first end of the lever arm is attached to the first extension arm and a second end of the lever arm is attached to the second extension arm. A variable restriction element is connected to the second end of the lever arm.

An assembly includes a first enclosed flexible pressure chamber. A first extension arm extends from a first endwall of the first enclosed flexible pressure chamber. A second enclosed flexible pressure chamber includes a second extension arm extending from a second endwall of the second enclosed flexible pressure chamber. A lever arm is disposed on a pivot. A first end of the lever arm is attached to the first extension arm and a second end of the lever arm is attached to the second extension arm. A variable restriction element is connected to the second end of the lever arm.

A radical polymerization method that enables synthesis, at a high conversion rate, of polymers having a relatively uniform molecular weight and is applicable to various monomers, and an apparatus used for the method. A reaction solution containing monomer and initiator is continuously or intermittently circulated in the apparatus and is heated in a heating-initiation unit to a predetermined temperature simultaneously across a radial direction of a cross section of the flow path whereby the initiator located in a particular volume of the reaction solution is cleaved all at once. The apparatus includes a heating medium production unit 10, a heating medium-reaction solution mixing unit 20, a cooling unit 30, and a recovery unit 40 for a reaction mixture, all communicatively connected by the flow path and optionally a heating reaction unit 60, a cooling unit 70, and a recovery unit 80, all communicatively connected by the flow path.

The invention is an enclosure installed on oil well equipment to capture escaping gas emissions and recover them using intermittent use of a vapor recovery unit which evacuates the gas that slowly accumulates in the enclosure to a custody line for commercial or treatment elsewhere.

Provide is a relief valve in which the flexibility of an attaching position is higher than a conventional relief valve. In the relief valve of the present invention, a discharge hole for discharging a fluid is arranged on a side surface of a cylindrical portion which protrudes from an end surface of a head portion in a bolt-type valve body. A direction change member which changes a direction in which the discharge hole is open to an arbitrary direction is provided. In this way, the relief valve is attached to a fluid device, and then with the direction change member, it is possible to direct the fluid discharge direction to a desired direction, and accordingly, the flexibility of the attaching position of the relief valve is enhanced as compared with the conventional relief valve.

Provide is a relief valve in which the flexibility of an attaching position is higher than a conventional relief valve. In the relief valve of the present invention, a discharge hole for discharging a fluid is arranged on a side surface of a cylindrical portion which protrudes from an end surface of a head portion in a bolt-type valve body. A direction change member which changes a direction in which the discharge hole is open to an arbitrary direction is provided. In this way, the relief valve is attached to a fluid device, and then with the direction change member, it is possible to direct the fluid discharge direction to a desired direction, and accordingly, the flexibility of the attaching position of the relief valve is enhanced as compared with the conventional relief valve.

A safety valve has a valve seat (8) and a sealing body (12) movable relative to the valve seat (8) along a first axis (X), the sealing body being biased with a holding force (F.sub.H) along this first axis (X) in the direction of the valve seat (8). A sealing element (24) is arranged on the sealing body (12) in a manner such that with one first side (32) it can be brought into sealing contact with the valve seat (8). A pressure surface situated on a second side (34) of the sealing element (24), which is opposite to the first side (32), is connected via a pressure channel (40) to a pressure region (4) surrounded by the valve seat (8). The sealing body (12) has a contact surface (25) coming to bear on a rest surface (10) in the closed condition of the safety valve.

A safety valve has a valve seat (8) and a sealing body (12) movable relative to the valve seat (8) along a first axis (X), the sealing body being biased with a holding force (F.sub.H) along this first axis (X) in the direction of the valve seat (8). A sealing element (24) is arranged on the sealing body (12) in a manner such that with one first side (32) it can be brought into sealing contact with the valve seat (8). A pressure surface situated on a second side (34) of the sealing element (24), which is opposite to the first side (32), is connected via a pressure channel (40) to a pressure region (4) surrounded by the valve seat (8). The sealing body (12) has a contact surface (25) coming to bear on a rest surface (10) in the closed condition of the safety valve.